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The probability of heads on the first flip is 50%.

The probability of heads on the second flip is 50%.

The probability of both is (50% x 50%) = 25% .

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Another way to look at it:

Two tosses can come up in four different ways:

H H

H T

T H

T T

Only one of these . . . H H . . . counts as success.

1 out of 4 = 25% .

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Q: What is the probability that a single coin flip will come up heads on the first two flips?
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What is the probability of exactly three heads in four flips of a coin given at least two are heads?

If you know that two of the four are already heads, then all you need to find isthe probability of exactly one heads in the last two flips.Number of possible outcomes of one flip of one coin = 2Number of possible outcomes in two flips = 4Number of the four outcomes that include a single heads = 2.Probability of a single heads in the last two flips = 2/4 = 50%.


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