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The sum of the digits in the unit place ...

The sum of the digits in the unit place of all the numbers formed with the help of 3,4,5,6 taken all at a time is

A

432

B

108

C

36

D

18

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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  15. If ""^(n)P(r)=""^(n)P((r+1))and ""^(n)C(r) = ""^(n)C(r-1), then (n,...

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

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  17. ""^(2n)C(n+1)+2. ""^(2n)C(n) + ""^(2n) C(n-1) =

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

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