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The number of five-digit numbers, greater than $40000$ and divisible by $5$ , which can be formed using the digits $0, 1, 3, 5, 7$ and $9$ without repetition, is equal to

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Important Questions on Permutation and Combinations

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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:

HARD

Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

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:

HARD

Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

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.

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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

HARD

Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

If the number of all possible permutations of the letters of the word $M A T H E M A T I C S$ in which the repeated letters are not together is $90 (X)$ , then $X =$

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

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 :

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

Two families with three members each and one family with four members are to be seated in a row. In how many ways can they be seated so that the same family members are not separated ?

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

The total number of permutations of

n (> 1)

different things taken not more than

r

at a time, when each thing may be repeated any number of times is

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

The value of (

2 \cdot^{1} P_{0} - 3 \cdot^{2} P_{1} + 4 \cdot^{3} P_{2} - . . . . . . . .

up to

51^{th}

term)

+

(

1! - 2! + 3! - . . . . . . .

up to

51^{th}

term) is equal to

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

Six identical coins are arranged in a row. The number of ways in which the number of tails is equal to the number of heads is

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

If all possible numbers are formed by using the digits

1, 2, 3, 5, 7

without repetition and they are arranged in descending order, then the rank of the number

327

HARD

Mathematics>Algebra>Permutation and Combinations>Factorial Notation

There are

10

red and

5

yellow roses of different sizes. If

x

is the number of garlands that can be formed with all these flowers so that no two yellow roses come together and

y

is the number of garlands formed with all these flowers so that all the red roses coming together, then

\frac{2 (x - y)}{10!} =

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 Combinations>Factorial Notation

The number of all

3 -

digits numbers

a b c

(in base

10

) for which

10

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Mathematics>Algebra>Permutation and Combinations>Factorial Notation

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 five-digit numbers, greater than 40000 and divisible by 5, which can be formed using the digits 0, 1, 3, 5, 7 and 9 without repetition, is equal to

Important Questions on Permutation and Combinations

Learn and Prepare for any exam you want !

The number of five-digit numbers, greater than $40000$ and divisible by $5$ , which can be formed using the digits $0, 1, 3, 5, 7$ and $9$ without repetition, is equal to