Mark the correct alternative in the following:
A fair coin is tossed a fixed number of times. If the probability of getting seven heads is equal to that of getting nine heads, the probability of getting two heads is
Given:
P(getting a head)=
Probability of getting 7 heads = nC7 (1/2)n
Probability of getting 9 heads = nC9 (1/2)n
Both probabilities are equal if n=9+7=16
So probability of getting 4 heads =16C4
16
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