Multiple choice

Three unbiased coins are tossed together, the probability of getting atleast one tail is

  1. 1/8

  2. 3/4

  3. 3/8

  4. 7/8
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D Correct answer
Explanation

The probability of getting no tails (all heads) is (1/2)^3 = 1/8. The probability of getting at least one tail is 1 - P(no tails) = 1 - 1/8 = 7/8.

AI explanation

When three unbiased coins are tossed, the total number of possible outcomes is 2^3 = 8. The only outcome that does not contain at least one tail is getting three heads (HHH), which is 1 specific outcome. The number of outcomes with at least one tail is 8 minus 1 = 7. Therefore, the required probability is 7/8.

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