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For any positive integer n, the total nu...

For any positive integer n, the total number of terms in the expansion of `(x+a)^(n)` is

A

`"^nC_rx^(n-r).a^r`

B

`"^nC_rx^(r).a^r`

C

`"^nC_(n-r)x^(n-r).a^r`

D

`"^nC_(n-r)x^(r).a^(n-r)`

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The correct Answer is:
A
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