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प्रश्न
Three coins are tossed simultaneously. What is the probability of getting exactly two heads?
विकल्प
`1/2`
`1/4`
`3/8`
`3/4`
उत्तर
`3/8`
Explanation:
When 3 coins are tossed simultaneously, the possible outcomes are HHH, HHT, HTH, THH, THT, HTT, TTH and TTT.
Total number of possible outcomes = 8
Let E be the event of getting exactly two heads.
Then, the favourable outcomes are HHT, THH, and HTH.
Number of favourable outcomes = 3
∴ Probability of getting exactly 2 heads = P(E) =`3/8`
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