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Co-efficient of alpha^t in thet expansi...

Co-efficient of `alpha^t` in thet expansion of `(alpha+p)^(m-1)+(alpha+p)^(m-2)(alpha+q)+(alpha+p)^(m-3)(alpha+q)^2+dot(alpha+q)^(m-1)` where `alpha != -q and p !=q` is :

A

`(.^(m)C_(t)(p^(t) - q^(t)))/(p-q)`

B

`(.^(m)C_(t)(p^(m-t) - q^(m-t)))/(p-q)

C

`(.^(m)C_(t)(p^(t) - q^(t)))/(p-q)`

D

`(.^(m)C_(t)(p^(m-t) + q^(m-t)))/(p-q)`

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The correct Answer is:
A
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