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If ""^(n)P(5)+5.""^(n)P(4)=""^(10)P(r) t...

If `""^(n)P_(5)+5.""^(n)P_(4)=""^(10)P_(r)` then 'r' is

A

5

B

4

C

3

D

7

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The correct Answer is:
A
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
  1. 1+1.1!+2.2!+3.3!+.......+n.n! is equal to

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  2. If ""^(n)P(5)+5.""^(n)P(4)=""^(10)P(r) then 'r' is

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  3. If ""^(n)P(r)=3024 then (n,r) is

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  4. If ""^(56)P((r+6)):""^(54)P((r+3))=30800:1, find r.

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  5. On a railway route there are 15 stations. The number of tickets requir...

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  6. The number of ways of 3 scholarships of unequal value be awarded to 17...

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  7. On a new year day every student of a class sends a card to every other...

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  8. The number of other permutations of the letters of the word SIMPLETON ...

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  9. The letters of the word "ARTICLE” are taken four at a time and arrange...

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  10. The number of arrangements that can be formed out of GANESHPURI so tha...

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  11. The number of arrangements that can be formed out of GANESHPURI so tha...

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  12. The number of arrangements that can be formed out of GANESHPURI so tha...

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  13. The number of arrangements that can be formed with the letters of the ...

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  14. The letters of the word “HOSTEL' are arranged so that vowels occupy th...

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  15. The letters of the word “RANDOM' are arranged in all possible ways. Th...

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  16. The number of ways of arranging 6 players to throw the cricket b...

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  17. The number of ways in which 5 boys and 5 girls can be arranged in a ro...

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  18. The number of ways in which 5 boys and 5 girls can be arranged in a ro...

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  19. A : the number of ways in which 5 boys and 5 girls can sit in a r...

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

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