Two fair coins are tossed. What is the probability of obtaining at least one head?

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Multiple Choice

Two fair coins are tossed. What is the probability of obtaining at least one head?

Explanation:
This question tests understanding of probability with independent events and using the complement rule. With two fair coins, there are four equally likely outcomes: HH, HT, TH, TT. “At least one head” includes everything except TT, so three outcomes work out of four, giving a probability of 3/4. Another way to see it is by the complement: the chance of no heads is both tails, which is (1/2) × (1/2) = 1/4, and 1 − 1/4 = 3/4. So the probability is 3/4.

This question tests understanding of probability with independent events and using the complement rule. With two fair coins, there are four equally likely outcomes: HH, HT, TH, TT. “At least one head” includes everything except TT, so three outcomes work out of four, giving a probability of 3/4. Another way to see it is by the complement: the chance of no heads is both tails, which is (1/2) × (1/2) = 1/4, and 1 − 1/4 = 3/4. So the probability is 3/4.

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