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Three unbiased coins are tossed simultaneously. What is probability of getting at least two tails?


1. 1/3
2. 2/3
3. 1/2
4. 1/6
5. 1/9

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Correct Answer - Option 3 : 1/2

Given:

Number of unbiased coin = 3

Calculation:

Total number of results when three coins are tossed = 23 = 8

Favourable result = (TTH, THT, HTT, TTT)

Number of favourable results = 4

∴ Probability of at least two heads = 4/8 = 1/2

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