A coin is flipped five times. Find the number of possible sets of heads and tails that have 2 heads.

A set with exactly 2 heads is determined by choosing which 2 of the 5 flips are heads. The number of choices is 5 choose 2 = (5 × 4) ÷ (2 × 1) = 10. Therefore, the correct choice is 10.

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