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Q.

A coin is tossed any number of times until a head appears. If x denotes the number of tosses till head appear then P (x ≥  2) =

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a

12

b

1

c

14

d

34

answer is A.

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Detailed Solution

p(X≥2)=(1−p(x=1)=1−12=12
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A coin is tossed any number of times until a head appears. If x denotes the number of tosses till head appear then P (x ≥  2) =