20. Three unbiased coins are tossed once, what is the probability of getting at least 1 head?
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Answer:
7/8
Step-by-step explanation:
Probability of getting at least one head = 1 − Probability of getting zero heads
Probability of getting zero heads = Probability of getting all tails (TTT) =
1/2 ³
Probability of getting at least one head =
1 - 1/8 = 7/8
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