P(tail) is 0.5. You want P(tail) AND P(tail) = 0.5 * 0.5 = 0.25 or 1/4.
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Assuming the coin is fair, it is (1/2)5 = 1/32.
The probability of flipping one coin and getting tails is 1/2. In order to find the probability of multiple events occurring, you find the product of all the events. For 3 coins the probability of getting tails 3 times is 1/8 because .5 x .5 x .5 = .125 or 1/8.
None, since that would imply that in 18 cases the coin did not show heads or tails!
1/2 of a chance since there are two sides to any coins it is always a half chance.