Recent questions and answers in Math

Let A = set of boys of XII class in some school. Let a R b, if and only if a and b use unfair means in the exam, $ a, b \in A$ Is R a transitive relation?

answered Oct 25 by Dadwalgaurav07

1 answer

To test the quality of electric bulbs produced in a factory, two bulbs are randomly selected from a large sample without replacement. If either bulb is defective, the entire lot is rejected. Suppose a sample of 200 bulbs contains 5 defective bulbs. Find the probability that the sample will be rejected.

answered Sep 18 by addisutheking

1 answer

find the equation of the normal to the curve y=x^3+2x^2 at x=0 find the coo

answered Jul 20 by noorlh

1 answer

From the point P(1, 2, 4 ) a perpendicular is drawn on the plane $ 2x+y-2z+3 = 0 $. Find the equation of the length and coordinates of the foot of the $ \bot $

answered Jul 20 by vikashkumarpaswan858

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P(A speaks truth is) = 4/5 . A coin is tossed. 'A' reports that a head appears. The probability that actually there was a head is.

answered Jul 13 by fad.vhora

1 answer

A speaks truth 8 times out of 10 times. A dice is tossed. He reports that it was 5. What is the probability that it was actually 5?

answered Jul 13 by fad.vhora

1 answer

A cylindrical metallic wire is stretched to increase its length by $5\%$. Calculate the percentage change resistance.

answered Jul 9 by jesanivar

1 answer

Find the volume of the tetrahedron formed by the four planes $x+y=0,y+z=0,z+x=0,x+y=1$

answered Jul 9 by meena.clay6

1 answer

Given P(A) = 0.3, P(B) = 0.2, Find P(B/A) if A and B are mutually exclusive events.

answered Jul 1 by abhav31

5 answers

If $ f^1(x)=g(x)\;and\;g^1(x)=-f(x)$ for all n and $f(2)=f^1(2)=4,$ find the value of $f^2(24)+g^2(24)$

answered Jun 24 by premkht

1 answer

Find the area bounded by the x-axis part of the curve $ y=1+\Large\frac{8}{x^2}$ and the ordinates x = 2 and x = 4 If the ordinate at x = a divides the area into two equal parts find 'a'

answered Jun 8 by keerthanapradeeshbabu

1 answer

A company makes two kinds of belts, belt A is of pure leather and belt B is macro based. The respective profits are Rs.40 and Rs.30 per belt. Each belt of type A requires twice as much time as a belt of type B and if all the belts were of type B a company could make 1000 belts per day. The supply of leather and macro is sufficient for only 8000 belts per day (both A and B combined). Belt A requires a fancy buckle and only 4000 buckles are available. There are only 7000 buckles per day available for belt B. What should be the daily production of each belt to have maximum profit?

answered Jun 3 by sripada.teja

1 answer

In Young’s double slit experiment, the two slits $0.15\;m$ apart are illuminated by monochromatic light of wavelength 450nm.$ The screen is $1.0\;m$ away from the slits. 1. Find the distance of the second a) bright fringe b) dark fringe from the central maximum. 2. How will the fringe pattern change, if the screen is moved away from the slits?

answered May 30 by utkarshguptamahan

1 answer

Show that the volume of the greatest cylinder that can be inscribed in a cone of height 'h' and semi-vertical angle $ \alpha $ is $ \large\frac{4}{27}\pi h^3\tan^2 \alpha $.

answered Apr 15 by supriyadutta98

1 answer

Differentiate ‘Cry’ and ‘cry’

answered Apr 9 by priyanka.clay6

1 answer

If A is a square matrix of order 3 such that |adj A|=64. Find |A'|.

answered Apr 8 by rp075974

1 answer

A square matrix A, of order 3, has | A | = 5, find | A.adj.A |.

answered Apr 8 by rp075974

1 answer

If A is square matrix of order 3 such that | adj.A |=81, find | A |.

answered Apr 8 by rp075974

2 answers

If A is an invertible matrix of order 3 and |A|=5 then find [adj.A].

answered Mar 20 by vinothperiyasamy.1991

1 answer

A small manufacturer has employed 5 skilled men 10 semi - skilled men and makes an article in two qualities deluxe model and an ordinary model. The making of a deluxe model requires 2 hrs work bt skilled man and 2 hrs work by a semi skilled man. The ordinary model requires 1 hr by a skilled man and 3 hrs by a semi skilled man. By union rules no mam may work more than 8 hrs per day. The manufactures clear profit on deluxe model is Rs.15 and an orsinary model is Rs. 10. How many of each type should be made in order to maximize his total daily profit.

answered Mar 18 by neenanagpal21

1 answer

Find the equation of the plane which contains the line of intersection of the planes $ \overrightarrow r. (\hat i + 2\hat j + 3\hat k ) -4 = 0 \overrightarrow r. (2\hat i + \hat j - \hat k ) + 5 = 0$ and which is perpendicular to the plane $\overrightarrow r. (5\hat i + 3\hat j - 6\hat k ) + 8 = 0 $ .

answered Mar 17 by kavithakavitha1805

1 answer

Three persons,A,B and C,fire at a target in turn,starting with A.Thier probability of hitting the target are 0.4,0.3 and 0.2 respectively.The probability of two hits is

answered Mar 12 by meena.clay6

1 answer

Let * be a binary operation on set Q of rational numbers defined as ab = $ \large\frac{3ab}{7} $. Write the identity for , if any.

answered Mar 11 by goguramchoudhary

1 answer

(a)Draw a circuit diagram of an n-p-n transmitter with its emitter base function forward biased and base collector junction reverse biased. Describe briefly its properties (b) Explain how a transistor in active state exhibits a low resistance at its emitter base junction and high resistance at its base collector junction .

answered Mar 5 by ujjawalkthakur

1 answer

A matrix A, of order 3 x 3, has determinant 4 find the value of |3A|.

answered Feb 24 by hargunnsingh633

1 answer

Find the equation of the plane passing through the points ( 1, 2, 3 ) and (0, -1, 0 ) and parrallel to the line, $ \large\frac{x-1}{2} = \frac{y+2}{3} = \frac{z}{-3} $.

answered Feb 21 by ayankumarroy7

1 answer

Which one of the following is a bird flu virus?

answered Feb 14 by lpmvenkateswaran621

1 answer

In a metre bridge experiment a student observed a balance point at the point J, where AJ = l. Draw the equivalent Wheatstone Bridge circuit diagram for this setup The values of R and X are both doubles and then interchanged. What would be the new position of the balance point? If in this set up, the galvanometer and battery are interchanged at the balance position, how will the balance point get affected?

answered Feb 11 by riyamalik2001oct

1 answer

Let N be the set of all natural numbers and R be the relation on N x N defined by (a, b) R (c, d) if ad = bc. Show that R is an equivalence relation.

answered Feb 10 by gopalkryadavsbg

1 answer

Two bags A and B contain 4 white and 3 black balls and 2 white,2 black balls respectively. From bag A, two balls are transferred to bag B. Find the probability of drawing (a) 2 white balls from Bag B? (b) 2 black balls from bag B? (c) 1 white and 1 black ball from bag B?

answered Jan 28 by cherub2001dec

1 answer

Find the equation of a line passing through the point (2,1,3) and perpendicular to the lines $ \large\frac{x-1}{1} = \frac{y-2}{2} = \frac{z-3}{3}$ and $\large\frac{x}{-3}=\frac{y}{2}=\frac{z}{5} $.

answered Jan 26 by abinshaji47

1 answer

Relation R in the set of Z of all integers defined as R = {(x, y) : x-y is an integer }.

answered Jan 26 by gunjankumarshahi9199

1 answer

Let X denote the number of hours you study during a randomly selected school day. The probability that X can take the values X has the following form, where k is some unknown constant. \[ p(X=x) = \left\{ \begin{array}{l l}0.1, & \quad if{ x = 0}\\ kx, & \quad if{ x = 1 \: or\: 2} \\ k(5-x), & \quad if{ x = 3 \: or\: 5} \\ 0, & \quad \: otherwise \end{array}. \right. \] (i) Find the value of K (ii) What is the probability that you study atleast two hours? Exactly two hours? Atmost two hours?

answered Jan 22 by pulkityadav56

1 answer

Write the number of all one-one functions from the set A = { a, b, c} to itself.

answered Jan 12 by singhankush1356

1 answer

A and B throws a pair of die turn by turn. The first to throw 9 is awarded by a prize. If A starts the game, show that the probability of A getting the prize is $\large \frac{9}{17} $.

answered Jan 12 by ankitgupta1301789

1 answer

Find the area of circle $ x^2+y^2=16$ which is exterior of the parabola $ y^2=6x$.

answered Jan 10 by www.rahimlaskar786

1 answer

The probability that student entering a university will graduate is 0.4. Find the probability that out of 3 students of the university: • None will graduate, • Only one will graduate, • All will graduate.

answered Jan 8 by subasri.arasu

1 answer

Let N be the set of natural numbers and R be the relation in N defined as $R = {(a, b) : a = b – 2, b > 6}$. Then \[ \begin{array} ((A)\: (2, 4) ∈ R \quad & (B)\: (3, 8) ∈ R \\ (C) \: (6, 8) ∈ R \quad & (D)\: (8, 7) ∈ R. \end{array} \]

answered Jan 3 by valasenthil

1 answer

Find the direction cosines of a line, passing through origin and lying in the first octant, making equal angles with the three coordinates axes.

answered Dec 28, 2018 by goyat78606

1 answer

The probability that a student entering an university will graduate is 0.4. Find the probability that out of 3 students of the university: (i) none will graduate (ii) only one will graduate (iii) all will graduate.

answered Dec 26, 2018 by shekhar81123987320

1 answer

If $ A=\begin{bmatrix} 2 & 0 & 0 \\ 0 & 2 & 0 \\ 0 & 0 & 2 \end{bmatrix},\;then\;A^5=?$

answered Dec 25, 2018 by awokekefale2018

1 answer

Find the area included between the parabolas $ y^2=4ax\;and\;x^2=4ay$

answered Dec 25, 2018 by kamaleshtiwari129

2 answers

What is the angle between the direction of electric field at any. (i) axial point and (ii) equatorial point due to an electrical dipole ?

answered Dec 22, 2018 by snhaich

1 answer

A company has two plants to manufacture motor cycled. 70% motor cycles are manufactured at the first plant, while 30% are manufactured at the second plant. At the first plant, 80% motor cycles are rated of the standard quality while at the second plant, 90% are rated of standard quality. A motor cycle, randomly picked up, is found to be of standard quality. Find the probability that it has come out from the second plant.

answered Dec 20, 2018 by randhirsingh6315

1 answer

The potential difference across the collector of a transistor, used in common emitter mode is $1.5\;V,$ with the collector resistance of $3\;k \Omega.$ Find 1. The emitter and 2. The base current, if the d.c. gain of the transistor is $50$

answered Dec 12, 2018 by mg.sankkar

1 answer

Two bags A and B contain 2 white, 4 red and 3 white, 3 red balls respectively. One of the bags is selected at random and a ball is drawn from it. If the selected ball is of white colour, find the probability that it is drawn from bag A.

answered Dec 6, 2018 by hrithwikp

1 answer

Give an account of Hershey and Chase experiment. What did it conclusively prove? If both DNA and pro

asked Jul 5, 2017 by pady_1

1 answer

During reproduction, the chromosome number (2n) reduces to half (n) in the gametes and again the ori

asked Jun 14, 2017 by pady_1

1 answer

find intervals in which function given by f(x) = sin 3x where x belongs [0, pi/2] is 1 increasing 2 decreasing

asked Feb 26, 2017 by myselfdishu

1 answer

If the points $(1,1,p)$ and $(-3,0,1)$ are at equidistant from the plane $\overrightarrow {r} . (3 \hat {i} +4 \hat {j} -12 \hat {k}) + 13 = 0, $ then find the value of p.

asked Dec 28, 2016 by priyanka.c

1 answer

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