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Recent questions tagged permutations-and-combinations

In how many ways can a team of 3boys and 3 girls be selected from 5 boys and 4 girls?

asked May 14, 2014 by sreemathi.v

1 answer

How many chords can be drawn through 21 points on a circle?

asked May 14, 2014 by sreemathi.v

1 answer

Determine $n$ if $2nC_3 : nC_3=11 : 1$

asked May 14, 2014 by sreemathi.v

1 answer

Determine $n$ if $2nC_3 : nC_2=12 : 1$

asked May 14, 2014 by sreemathi.v

1 answer

If $nC_8=nC_2$ Find $nC_2$

asked May 14, 2014 by sreemathi.v

1 answer

In how many ways can the letters of the word PERMUTATIONS be arranged if the There are always $4$ letters between $P$ and $S$?

asked May 13, 2014 by sreemathi.v

1 answer

In how many ways can the letters of the word PERMUTATIONS be arranged if the Vowels are together?

asked May 13, 2014 by sreemathi.v

1 answer

In how many ways can the letters of the word PERMUTATIONS be arranged if the Words start with P and end with $S$?

asked May 13, 2014 by sreemathi.v

1 answer

In how many of the distinct permutations of the letters in MISSISSIPPI do the four $'I'$s not come together?

asked May 13, 2014 by sreemathi.v

1 answer

How many words,with or without meaning can be made from the letters of the word MONDAY,assuming that no letter is repeated if, All letters are used but first letter is a vowel?

asked May 13, 2014 by sreemathi.v

1 answer

How many words,with or without meaning can be made from the letters of the word MONDAY,assuming that no letter is repeated if, All the letters of word MONDAY are taken at a time?

asked May 13, 2014 by sreemathi.v

1 answer

How many words,with or without meaning can be made from the letters of the word MONDAY,assuming that no letter is repeated if, $4$ letters are used at a time ?

asked May 13, 2014 by sreemathi.v

1 answer

How many words can be formed using all letters of the word equation,using each letter exactly once?

asked May 13, 2014 by sreemathi.v

1 answer

Find $r$ if $5P_r=6P_{r-1}$

asked May 13, 2014 by sreemathi.v

1 answer

Find $r$ if $5P_r=2^6P_{r-1}$

asked May 13, 2014 by sreemathi.v

1 answer

Find $n$ if $^{n-1}P_3 : ^nP_4=1 : 9$

asked May 13, 2014 by sreemathi.v

1 answer

From a committee of 8 persons,in how many ways can we choose a chairman and a vice chairman assuming one person cannot hold more than one position

asked May 13, 2014 by sreemathi.v

1 answer

Find the 4-digit numbers that can be formed using the digits 1,2,3,4,5 if no digit is repeated.How many of will be even?

asked May 13, 2014 by sreemathi.v

1 answer

How many 3-digit even numbers can be made using the digits 1,2,3,4,6,7 if no digit is repeated.

asked May 13, 2014 by sreemathi.v

1 answer

How many n-digit numbers are there with no digit repeated?

asked May 13, 2014 by sreemathi.v

1 answer

How many 3-digit numbers can be formed by using the digits 1 to 9,if no digit is repeated?

asked May 13, 2014 by sreemathi.v

1 answer

Evaluate $\large\frac{n!}{(n-r)!}$ when n=9,r=5

asked May 13, 2014 by sreemathi.v

1 answer

Evaluate $\large\frac{n!}{(n-r)!}$ when $n=6,r=2$

asked May 13, 2014 by sreemathi.v

1 answer

If $\large\frac{1}{6!}+\frac{1}{7!}=\frac{x}{8!}$ find $x$

asked May 13, 2014 by sreemathi.v

1 answer

Compute $\large\frac{8!}{6!\times 2!}$

asked May 13, 2014 by sreemathi.v

1 answer

Is $3!+4!=7!$

asked May 13, 2014 by sreemathi.v

1 answer

Evaluate : $4!-3!$

asked May 13, 2014 by sreemathi.v

1 answer

Evaluate :$8!$

asked May 13, 2014 by sreemathi.v

1 answer

Given 5 flags of different colours,how many different signals can be generated if each signal requires the use of 2 flags,one below the other?

asked May 13, 2014 by sreemathi.v

1 answer

A coin is tossed 3 times and the outcomes are recorded.How many possible outcomes are there?

asked May 13, 2014 by sreemathi.v

1 answer

How many 5-digit telephone numbers can be constructed using the digit 0 to 9 if each number starts with 67 and no digit appear more than once?

asked May 13, 2014 by sreemathi.v

1 answer

How many 4-letter code words are possible using the first 10 letters of the english alphabet,if no letter can be repeated?

asked May 13, 2014 by sreemathi.v

1 answer

How many 3-digit even numbers can be formed from the digits 1,2,3,4,5,6 if the digits can be repeated?

asked May 13, 2014 by sreemathi.v

1 answer

How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 assuming repetition of digits is not allowed

asked May 13, 2014 by sreemathi.v

1 answer

How many 3-digit numbers can be formed from the digits 1,2,3,4 and 5 assuming repetition of digits is allowed

asked May 13, 2014 by sreemathi.v

1 answer

In how many ways can a mixed doubles game in tennis can be arranged from 5 couples, if no husband and wife play in the same game?

asked Nov 23, 2013 by rvidyagovindarajan_1

1 answer

$S=\{1,2,3..............12\}$ $A,B,C $ are disjoint equivalent subsets of $S$ so that $A\cup B\cup C=S$. How many such sets $A,B,C$ can be formed?

asked Sep 14, 2013 by rvidyagovindarajan_1

1 answer

There are 9 Judges in a beauty contest. A particular candidate is selected as the winner if she gets maximum number of votes in favour. In how many ways a particular candidate is declared the winner?

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

For $n\geq 4$, $1!+2!+3!+4!+.....n!$ is always

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

There are 10 men. 5 of them are to be selected for a team. In how many ways this can be done if a particular person is to be selected in the team and if A is selected then B also is to be selected?

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $^nC_3=220$, then $n=?$

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $^{a^2-a}C_2=^{a^2-a}C_4,$ then $a=?$

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

$^nC_r+2.^nC_{r-1}+^nC_{r-2}=?$

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $ ^{n-1}C_6+^{n-1}C_7>^nC_6$, then $n$ is ?

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $^nP_r=720^nC_r$, then r=?

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $^nC_{r-1}=36$, $^nC_r=84$ and $^nC_{r+1}=126$, then $r$ = ?

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

If $^nC_{12}=^nC_8,$ then $n = ?$

asked Sep 6, 2013 by rvidyagovindarajan_1

1 answer

In how many ways a mixed double games can be arranged from 8 married couples if no husband and wife play in the same game?

asked Sep 5, 2013 by rvidyagovindarajan_1

1 answer

$(100)!+1$ is divisible by?

asked Sep 5, 2013 by rvidyagovindarajan_1

1 answer

A bag contains 3 black 4 white and 2 red balls, all balls being different. The number of selection of at the most 6 balls so that each selection has balls of all the 3 colours is ?

asked Sep 5, 2013 by rvidyagovindarajan_1

1 answer

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