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f:AtoA,A={a(1),a(2),a(3),a(4),a(5)}, the...

`f:AtoA,A={a_(1),a_(2),a_(3),a_(4),a_(5)}`, the number of one one functions so that `f(x_(i))nex_(1),x_(i)inA` is

A

44

B

88

C

22

D

20

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A
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
  1. Find the sum of all 4 digited numbers that can be formed using the dig...

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  2. The sum of the digits in the unit place of all the numbers formed with...

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  3. f:AtoA,A={a(1),a(2),a(3),a(4),a(5)}, the number of one one functions ...

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  4. The number of ways in which 4 letters can be put in 4 addressed envelo...

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  5. If the 4 letter words formed by using the letters of the word EQUATION...

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  6. Assertion (A): The number of ways in which 5 boys and 5 girls can sit ...

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  7. Assertion (A) : The number of ways in which 6 persons can sit around a...

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  8. sum(r=0)^(n)(P(r))/(r!) is equal to

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  9. If ""^(n)P(r)=""^(n)P((r+1))and ""^(n)C(r) = ""^(n)C(r-1), then (n,...

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  10. IF ""^(n) P(r)=720,""^(n)C(r)=120then (n,r)=

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  11. ""^(2n)C(n+1)+2. ""^(2n)C(n) + ""^(2n) C(n-1) =

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  12. the value of ""^50C(4) + underset( r=1) overset( 6 ) sum ""^(56...

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  13. sum( r=0 )^ ( 10) ( 40 -r)C (5)=

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  14. If ""^(n-1)C(3)+""^(n-1)C(4)gt""^(n)C(3), then

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  15. If ""^(n)C(4),""^(n)C(5),""^(n)C(6) are in A.P., then the value of n i...

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  16. If ""^(n)C(r-1)=36,""^(n)C(r)=84 and ""^(n)C(r+1)=126, then r is equal...

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  17. The value of 2^(n)n!(1.3.5.....(2n-1)) is

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  18. If a(n)=sum(r=0)^(n)(1)/(""^(n)C(r)) then sum(r=0)^(n)(r)/(""^(n)C(r))...

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  19. ""^(n)C(r)+4.""^(n)C(r-1)+6.""^(n)C(r-2)+4.""^(n)C(r-3)+""^(n)C(r-4) i...

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  20. The sum sum(i=0)^(m)((10)/(i))((20)/(m-i)) is maximum when m is

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