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Question

What is the probability of getting 3 heads when 3 unbiased coins are tossed simultaneously?

A
25
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B
15
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C
18
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D
38
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Solution

The correct option is C 18
When 3 unbiased coins are tossed simultaneously, the outcomes are{HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}
Total number of outcomes = 8
Number of outcomes that favours all 3 heads = {HHH}=1
probability=18

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