The answer depends on what the experiment is!
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Probably 3/4
The probability is 5/16.
The probability of obtaining exactly two heads in three flips of a coin is 0.5x0.5x0.5 (for the probabilities) x3 (for the number of ways it could happen). This is 0.375. However, we are told that at least one is a head, so the probability that we got 3 tails was impossible. This probability is 0.53 or 0.125. To deduct this we need to divide the probability we have by 1-0.125 0.375/(1-0.125) = approximately 0.4286
It is approx 0.0938
About a 1 in 16 chance of getting a coin to land on heads 4 times in a row.