Multiple choice

The probability of getting at least one tails in 4 tosses of a coin is:

  1. 15 16

  2. 1 16

  3. 1 4

  4. 1
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A Correct answer
Explanation

Total outcomes for 4 tosses = 2^4 = 16. Probability of no tails (all heads) = 1/16. Probability of at least one tail = 1 - P(no tails) = 1 - 1/16 = 15/16.

AI explanation

Using the complement rule, the probability of getting at least one tails equals 1 minus the probability of getting all heads. For 4 tosses, the probability of all heads is (1/2) raised to the power of 4, which is 1/16. Subtracting this from 1 gives 15/16.

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