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7/8

P(all heads) = (1/2)*(1/2)*(1/2)=(1/8).

P(at least one tails) = 1-P(all heads) = 7/8.

Another (more time-consuming) way to get the same result:

P(all tails) = (1/2)^3=1/8

P(exactly two tails) = 3*(1/2)^3=3/8

P(exactly one tails) = 3*(1/2)^3=3/8

P(at least one tail) = P(all tails) + P(exactly two tails) + P(exactly one tails) = 7/8

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