The result of each event (or flip) is independent of the others. Therefore, the individual probabilities can be multiplied.
P(HTHT) = Probability of (heads-tails-heads-tails):
1/2 x 1/2 x 1/2 x 1/2 = 1/16
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The probability is 1/2 if the coin is flipped only twice. As the number of flips increases, the probability approaches 1.
If it is a fair coin, the probability of getting at least one Head from 3 flips is 7/8If it is a fair coin, the probability of getting at least one Head from 3 flips is 7/8If it is a fair coin, the probability of getting at least one Head from 3 flips is 7/8If it is a fair coin, the probability of getting at least one Head from 3 flips is 7/8
In an infinite series of flips it is 1 = a certainty.In only two flips it is 1/4.In an infinite series of flips it is 1 = a certainty.In only two flips it is 1/4.In an infinite series of flips it is 1 = a certainty.In only two flips it is 1/4.In an infinite series of flips it is 1 = a certainty.In only two flips it is 1/4.
It is approx 0.2461
The probability of obtaining 7 heads in eight flips of a coin is:P(7H) = 8(1/2)8 = 0.03125 = 3.1%