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An unbiased coin is tossed n times. Let ...

An unbiased coin is tossed n times. Let X denote the number of times head occurs. If `P(X=4), P(X=5) and P(X=6)` are in A.P, then the value of n can be

A

13

B

7

C

11

D

12

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The correct Answer is:
B
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