Recent questions in Permutations and Combinations

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

(n+2)! = 60(n-1)!

asked Jun 4, 2013 by munluohaupu

1 answer

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