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The number of ways in which ten candidat...

The number of ways in which ten candidates `A_(1),A_(2),A_(3),A_(4),……,A_(10)` can be arranged in a row
if `A_(1)` and `A_(2)` are next to each other is

A

`9!2!`

B

`10!`

C

`10!2!`

D

`9!`

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The correct Answer is:
A
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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  2. A : the number of ways in which 5 boys and 5 girls can sit in a r...

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  3. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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  4. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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  5. The number of ways in which candidates A1,A2 ,. . . A(10) can b...

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  6. The number of ways in which ten candidates A(1),A(2),A(3),A(4),……,A(10...

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  7. Find the number of ways of seating 10 students A(1), A(2)…..A(10) in a...

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  8. s(1),s(2) ...............,s(10) are the speakers in a conference, If s...

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  9. The letters of the word 'HEXAGON' are arranged in all possible ways. I...

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  10. 9 balls are to placed in 9 boxes : and 5 of the balls cannot ...

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  11. The number of odd numbers having 4 digits can be formed from

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  12. Total number of four digit odd numbers that can be formed using 0, 1, ...

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  13. The number of four digit even numbers that can be formed from 0,1,2,3,...

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  14. The number of positive integers which can be formed by any number of d...

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  15. The number of natural numbers less than 1000, in which no two dig...

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  16. The number of 5-digited numbers which are not divisible by 5 and which...

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  17. The number of four-digit numbers formed by using the digits 0,2,4,5 an...

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  18. The number of four digited numbers formed by 1, 2, 5, 6, 7 divisible b...

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  19. The number of four digited numbers formed by 2, 4, 5, 7, 8 divisible b...

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  20. Five digit numbers divisible by 3 is formed using 0, 1, 2, 3, 4 and 5 ...

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