The possible outcomes are
HH, HT, TH and TT.
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The probability of tossing two heads in two coins is 0.25.
24 possible outcomes.
There are eight possible outcomes: HHH, HHT, HTT, HTH, THT, TTT, TTH, THH.
The probability that both coins are heads is the probability of one coin landing heads multiplied by the probability of the second coin landing heads: (.5) * (.5) = .25 or (1/2) * (1/2) = 1/4
HHHH, HHHT, HHTT, HTTT, TTTT. Pr(HHTT) = 6/16 = 0.375