If two coins are flipped, the probability of getting at least one head is?

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Multiple Choice

If two coins are flipped, the probability of getting at least one head is?

Explanation:
The key idea is to use a complement: find the probability of the opposite event and subtract from one. Flipping two fair coins gives four equally likely outcomes: both heads, head then tails, tails then head, and both tails. Only one of these has no heads, so there are three outcomes that include at least one head. Therefore, the probability is three out of four, or three quarters.

The key idea is to use a complement: find the probability of the opposite event and subtract from one. Flipping two fair coins gives four equally likely outcomes: both heads, head then tails, tails then head, and both tails. Only one of these has no heads, so there are three outcomes that include at least one head. Therefore, the probability is three out of four, or three quarters.

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