Recent questions tagged permutation and combination

+3 votes

1 answer

The number of different four digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is

asked Apr 7, 2019 in JEE by kratos

+1 vote

1 answer

A man has 7 relatives in which 4 are ladies and 3 are gentlemen. His wife also has 7 relatives in which 3 are ladies and 4 are gentlemen.

asked Apr 3, 2019 in JEE by kratos

+1 vote

1 answer

The total number of 9 digit numbers which have all different digits is

asked Apr 2, 2019 in JEE by kratos

+1 vote

1 answer

There are 10 identical coins and each one of them has ‘H’ engraved on its one face and ‘T’

asked Mar 30, 2019 in Mathematics by kratos

+2 votes

1 answer

Write a notice in about 80 words for you school notice board to invite students of you school to participate in a Drama Competition.

asked Mar 7, 2019 in Class 11 by kratos

+2 votes

1 answer

Possible number of words taking all letters at a time such that at least one repeating letter is at odd position in each word, is

asked Mar 3, 2019 in JEE by kratos

+3 votes

1 answer

Σ nCr 4^r, r ∈ [r=0, n] = .....

asked Feb 26, 2019 in JEE by kratos

+1 vote

1 answer

A square is divided into 9 identical smaller squares. Six identical ***** are to be placed in these smaller

asked Feb 26, 2019 in Mathematics by kratos

+3 votes

1 answer

Find the number of chords that can be drawn through 16 points on a circle.

asked Feb 23, 2019 in Class 9 by kratos

+1 vote

1 answer

Consider a collection of a large number of particles each with speed v. The direction of velocity is randomly distributed

asked Feb 21, 2019 in JEE by kratos

+3 votes

1 answer

A group of 630 ******** is seated in rows for a group photo session. Each row contains three less ******** than the row in front of it.

asked Feb 20, 2019 in Mathematics by kratos

+1 vote

1 answer

If 1/4Cn = 1/5Cn + 1/6Cn, then value of n is ........

asked Feb 19, 2019 in JEE by kratos

+2 votes

1 answer

The sum of the digits in unit place of all the numbers formed with the help of 3, 4, 5 and 6 taken all at a time is

asked Feb 18, 2019 in JEE by kratos

+3 votes

1 answer

Each of eight identical ***** is to be placed in the squares shown in the figures given below

asked Feb 14, 2019 in Mathematics by kratos

+1 vote

1 answer

Number greater than 1000 but less than 4000 is formed using the digits 0, 2, 3, 4 repetition allowed is

asked Feb 12, 2019 in JEE by kratos

+1 vote

1 answer

From 6 different novels and 3 different dictionaries, 4 novels and 1 dictionary are to be selected

asked Feb 11, 2019 in JEE by kratos

+1 vote

1 answer

How many different 3 letter words can be made by 5 vowels, if vowel ‘A’ will never be included?

asked Feb 9, 2019 in Mathematics by kratos

+1 vote

1 answer

An n digit positive number with exactly n digits. Nine hundred distinct n-digit numbers are to be formed using only the three digits 2, 5 and 7.

asked Feb 5, 2019 in JEE by kratos

+3 votes

1 answer

If 25^15 is divided by 13, the reminder is _________ .

asked Feb 5, 2019 in JEE by kratos

+1 vote

1 answer

The total number of ways in which six ‘+’ and four ‘–’ signs can be arranged in a line

asked Jan 28, 2019 in Class 11 by kratos

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