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A fair coin is tossed repeatedly and independently, Find the expected number of tosses till the pattern HTH appears. 1/2 H HT HTH 1/2 1/2

A fair coin is tossed repeatedly and independently, Find the expected number of tosses till the pattern HTH appears.

1/2 H HT HTH 1/2 1/2 1/2 1/2 1/2

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