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16-02-2024
Mathematics

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A coin is biased so that the head is 3 times as likely to occur as tail. This coin is tossed until a head or three tails occur. If X denotes the number of tosses of the coin, then the mean of X is

(1) 21/16
(2) 81/64
(3) 15/16
(4) 37/16

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