The probabilities of HH, TT, and HT or TH are 0.25, 0.25, and 0.50.
Probability means the occurrence of a random event. The value of probability can only be from 0 to 1.
The sample space will be
Sample = 4 {HH, HT, TH, TT}
The probability of getting Head on both coins will be
P(HH) = 0.25
The probability of getting Tail on both coins will be
P(TT) = 0.25
The probability of getting one Head and one Tail will be
P(HT, TH) = 0.5
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