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Number of times the coin is tossed = 4
Probability of getting a tail for the first time = 1/2
Probability of getting a head for the second time = 1/2
Probability of getting a head for the third time = 1/2
Probability of getting a tail the fourth time = 1/2
=> Required probability = (1/2) (1/2) (1/2) (1/2) = 1/16
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