.125
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It is (1/2)3 = 1/8
P(4T1H)) = 5C4 ∙ (0.5)5 = 5/32 = 0.15625 ≈ 15.6% where 5C4 = 5!/[3!∙(5-3)!] = 5
Pr(3 Heads) = 0.125 Pr(2 Heads and 1 Tail) = 0.375 Pr(1 Head and 2 Tails) = 0.375 Pr(3 Tails) = 0.125
3 coins can land in 8 different ways. Only one of these ways is all tails. So the probability of rolling at least one heads is 7/8 = 87.5% .
The probability of tossing a die and getting three 6's in a row is (1/6)3, or about 0.004630.