probability of head on first toss=head on second toss=1/4;
probability of head on (2n-1)th toss=head on 2n-th toss=1/2^(n+1)
no head on all n tosses=0
total probability=1.
•
不是很明白
-Commentate-
♂
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07/18/2009 postreply
18:31:39