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realcookie
50% chance i hope this helps bye bye
blaze4
You have have to add up probabilities of it appearing on 1,2,3,4,5 tries. So t=1/2, ht=1/4,hht=1/8, hhht=1/16,hhhht=1/32. You add up all those probabilities and that is the pr(X less than equal to 5) for x=1,...5

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