Arithmetic Ability
 Probability

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Q.

Three unbiased coins are tossed.What is the probability of getting at least 2 heads?

View Answer

Correct choice: B

Explanation:

Here S= {TTT, TTH, THT, HTT, THH, HTH, HHT, HHH}. Let E = event of getting at least two heads = {THH, HTH, HHT, HHH}. P(E) = n(E) / n(S) = 4/8= 1/2
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