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JEE Advanced Mathematics question

MathematicsProbabilityJEE Advanced

A fair coin is tossed repeatedly. The probability of getting a result in the fifth toss different from those obtained in the first four tosses is

Answer: (D)

Solution

The fifth result can differ from all of the first four only if those four are all the same: either HHHH followed by T, or TTTT

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Question ID VK-109758