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Bobbie Tosses a Coin Twice...
Bobbie tossed a coin twice (a fair coin mind you). At least one of the coins landed on heads. What is the probability that each coin toss came up heads?
1/2 => {HH, HT}
1/3 => {{{HH}, HT, TH}, TT}
1/1 => {HH}
1/8 => {H,H,{H,H},T,T,T,T}
Choices 1 and 2
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math
probability
discrete-mathematics
conditional-probability