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Q.

A fair coin is tossed a fixed number times. If the probability of getting seven heads is equal to that of getting nine heads then the probability of getting one heads is

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a

1528

b

215

c

15213

d

16216

answer is D.

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Detailed Solution

p(X=7)=p(X=9)⇒nc7(12)n=nc9(12)n⇒n=16 p(X=1)= 16C1(12)16

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