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Question

If the absolute term (independent of x) in the expansion of (xkx2)10 is 405 then k =



Your Answer
A

Your Answer
B

Correct Answer
C

Your Answer
D


Solution

The correct option is B


r=10×1212+2=105=2

Term independent of x is 10C2(k)2=45k2.   45k2=405k2=9k=±3

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