Arithmetic Ability
 Probability

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Q.

Three unbiased coins are tossed. What is the probability of getting at most two heads ?

View Answer

Correct choice: D

Explanation:

Let S be the sample space. Here n(S)= 23 = 8 Let E be the event of getting atmost two heads. Then, n(E) = {(H,T,T), (T,H,T), (T,T,H), (H,H,T), (T,H,H), (H,T,H)} Required probability = n(E)/n(S) = 6/8 = 3/4.
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