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Q.

The coefficient of x50 in the expansion of ∑k=0200Ck 200(x−3)200−k2k

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a

200C 50

b

−200C 50

c

200C 100

d

−200C 100

answer is A.

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Detailed Solution

∑k=0200 200Ck(x−3)200−k2k=((x−3)+2)200=(x−1)200=(1−x)200∴ coefficient of x50 is 200C50

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