Multiple choice

If an unbiased coin is tossed five times, what is the probability of getting at least a single head?

  1. 1 / 32

  2. 31 / 32

  3. 7 / 32

  4. 11 / 32
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The probability of getting no heads in 5 tosses is (1/2)^5 = 1/32. The probability of at least one head is 1 - P(no heads) = 1 - 1/32 = 31/32.

AI explanation

Using the complement event method, the probability of getting at least one head equals 1 minus the probability of getting no heads. The probability of getting all tails in five tosses is (1/2)^5, which equals 1/32. Therefore, the probability of getting at least one head is 1 minus 1/32, resulting in 31/32.

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