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There are 8 permutations of three coins. Of these, 3 of them have two heads, so the probability of tossing two heads on three coins is 3 in 8, or 0.375.

However, you said, "at least", so that includes the case of three heads, so the probability of throwing at least two heads is 4 in 8, or 0.5.

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T T H

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H T T

H T H *

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โˆ™ 2011-05-14 23:53:24
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Q: What is probability of at least 2 heads on tossing 3 coins?
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When tossing 5 coins simultaneously what is the probability that at least 1 head is showing?

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