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When 4 coins are tossed what is the probability that only 1 of them turns up heads?

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When 4 coins are tossed the probability that only 1 of them turns up heads has to be determined.

Each of the coins can turn up heads or tails. This gives the number of possible outcomes as 2^4 = 16. If only one of the coins has to turn up heads, the other 3 must turn up tails. There are four ways in which this can happen.

The required probability is 4/16 = 1/4.

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