ProbabilityHard

Question

A coin is tossed indefinitely. Probability that the fourth head occurs before the sixth toss is equal to -

Options

A.1/16
B.2/16
C.3/16
D.4/16

Solution

First five tosses must contain either 4H + 1T or 5H
⇒ Required probability = P(4H + 1T) + P(5H)
= 5C4 ×

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