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Question 270017
JEE Mathematics · Medium

Probability: Mixed MCQ

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MixedMediumQuestion 270017

Question

Three unbiased coins are tossed. P(at least one head) is:
  1. A
    7/8
    Correct
  2. B
    1/2
  3. C
    3/8
  4. D
    1/8

Correct answer

7/8

Explanation

P(at least 1 head) = 1 − P(no heads) = 1 − (1/2)³ = 1 − 1/8 = 7/8.

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