Possible outcomes are HH, HT, TH, TT; therefore the probability of HH is 1/4 or 0.25.
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The probability is 0.375
The conditional probability is 1/4.
1/2
The probability of getting at least one tail in a flip of six coins is the same as the probability of not getting all heads, which is 1 - (0.56), or 0.984375.
If you are talking about coins, 25% If you are talking about genetics, then it is less than 1%.