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Coefficient of x^(48) in sum(r=0)^(50)""...

Coefficient of `x^(48)` in `sum_(r=0)^(50)""^(50)C_(r).(x-2)^(x).3^(50-r)` is

A

`.^(50)C_(2)`

B

`.^(48)C_(2)`

C

`3^(48)`

D

none of these

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The correct Answer is:
A
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