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

`""^(n)C_(r)+4.""^(n)C_(r-1)+6.""^(n)C_(r-2)+4.""^(n)C_(r-3)+""^(n)C_(r-4)` is equal to

A

`""^(n+4)C_(r)`

B

`2.""^(n+4)C_(r-1)`

C

`""^(n)C_(r)`

D

`11.""^(n)C_(r)`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
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