1
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Question

# If a coin is tossed twice, find the probability of getting at least one head.

A
12
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B
14
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C
34
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D
23
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Solution

## The correct option is C 34The only way in which at least one head will not occur is if both tosses give tails.S=HH,HT,TH,TTThe probability of this is the probability of a single tails multiplied by itself.The probability of this is approximately 12, so the probability of two in a row is 12∗12=14If the probability of getting no heads is 14 , the probability of getting at least one head is 1−14=34

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