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Recent questions tagged maths

The value of $ \sum _{r=16} ^{30} (r+2)(r-3)$ s equal to

asked Sep 29, 2015 by meena.p

1 answer

If the coefficients of the three successive terms in the binomial expansion of $(1+x)^n$ are in the ratio $1 : 7 : 42$, then the first of these terms in the expansion is :

asked Sep 29, 2015 by meena.p

1 answer

Let the sum of the first three terms of an A.P. be 39 and the sum of its last four terms be 178. If the first term of this A.P. is 10, then the median of the A.P. is :

asked Sep 29, 2015 by meena.p

1 answer

The number of ways of selecting 15 teams from 15 men and 15 women, such that each team consists of a man and a woman, is :

asked Sep 29, 2015 by meena.p

1 answer

If $A=\begin{bmatrix} 0 & -1 \\ 1 & 0 \end{bmatrix}$ then which one of the following statements is not correct ?

asked Sep 29, 2015 by meena.p

1 answer

The least value of the product xyz for which the determinant $\begin{bmatrix}x & 1 & 1\\1 & y & 1\\1 & 1 & z\end{bmatrix}$ is non-negative , is :

asked Sep 29, 2015 by meena.p

1 answer

If $2+3i$ is one of the roots of the equation $2x^3-9x2+kx-13=0,$ k \in R$, then the real root of this equation

asked Sep 29, 2015 by meena.p

1 answer

The largest value of r for which the region represented by the set $\{\omega \in C/| \omega -4-i| \geq r \}$ is contained in the region represented by the set $\{z \in C/|Z-1| \geq | z+i| \}$ is equal to :

asked Sep 29, 2015 by meena.p

0 answers

In a certain town, $25\%$ of the families own a phone and $15 \%$ own a car ; $65\%$ families own neither a phone nor a car and $2,000$ families own both a car and a phone.Consider the following three statements : (a) $5\%$ families own both a car and a phone. (b) $35\%$ families own either a car or a phone. (c) $40,000$ families live in the town. Then,

asked Sep 29, 2015 by meena.p

1 answer

Remove arbitrary constants from the function $x = c_1 \cos wt + c_2 \sin wt$, where $c_1, c_2$ are arbitrary constants.

asked Oct 1, 2014 by hectordavid1995

1 answer

Form the differential equation of the family of parabolas with vertex on the x axis with symmetry axis parallel to the axis y positive and the vertex to focus distance equal to P.

asked Sep 30, 2014 by hectordavid1995

1 answer

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