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The number of seven digit integers, with sum of the digits equal to 10 and formed by using the digits 1, 2 and 3 only, is

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Important Questions on Permutation and Combination

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

If all the words (with or without meaning) having five letters, formed using the letters of the word

S M A L L

and arranged as in a dictionary; then the position of the word

S M A L L

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

If all the words, with or without meaning, are written using the letters of the word QUEEN and are arranged as in English dictionary, then the position of the word QUEEN is:

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

From

6

different novels and

3

different dictionaries,

4

novels and

1

dictionary are to be selected and arranged in a row on a shelf so that the dictionary is always in the middle. The number of such arrangements is:

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of four-digit numbers strictly greater than

4321

that can be formed using the digit

0,1, 2,3, 4,5

(repetition of digits is allowed) is:

EASY

Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

{}^{56}{P_{r + 6}} : {}^{54}{P_{r + 3} = 30800 : 1}

,

then

r

is equal to

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of

4

letter words (with or without meaning) that can be formed from the eleven letters of the word

EXAMINATION

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The sum of the digits in the unit's place of all the

4

- digit numbers formed by using the numbers

3, 4, 5

and

6

, without repetition is :

HARD

Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of

4

digit numbers without repetition that can be formed using the digits

1, 2, 3, 4, 5, 6, 7

in which each number has two odd digits and two even digits is

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of distinct primes dividing

12! + 13! + 14!

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

How many ways are there to arrange the letters of the word

EDUCATION

so that all the following three conditions hold?
- the vowels occur in the same order

(EUAIO),

- the consonants occur in the same order

(DCTN),

- no two consonants are next to each other.

EASY

Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of

6

digit number that can be formed using the digits

0, 1, 2, 5, 7

and

9

which are divisible by

11

and no digit is repeated is:

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

How many natural numbers

n

are there such that

n! + 10

is a perfect square ?

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

How many numbers of four digits can be made by using the digits $3, 5, 6, 7,$ and $9$ ? (Repetition of digits is not allowed)

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

All possible numbers are formed using the digits

1, 1, 2, 2, 2, 2, 3, 4, 4

taken all at a time. The number of such numbers in which the odd digits occupy even places is

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

In how many ways the letters of word 'MACHINE' can be arranged so that vowels will always be together?

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

If the letters of the word

^{'} {MOTHER}^{'}

be permuted and all the words so formed (with or without meaning) be listed as in a dictionary, then the position of the word

^{'} {MOTHER}^{'}

is.....

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

{}^{n}P_{r} = 840

and

{}^{n}C_{r} = 35

, then the value of

r

is equal to

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The largest non-negative integer

k

such that

24^{k}

divides

13!

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

The number of all

3 -

digits numbers

a b c

(in base

10

) for which

10

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Mathematics>Algebra>Permutation and Combination>Permutations when All the Objects are Distinct

Two girls and four boys are to be seated in a row in such a way that the girls do not sit together. In how many different ways can it be done?

The number of seven digit integers, with sum of the digits equal to 10 and formed by using the digits 1, 2 and 3 only, is

Important Questions on Permutation and Combination

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