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In an examination 20 questions of true f...

In an examination 20 questions of true false type are asked. Suppose a student tosses a fair coin to determine his answer to each question. If the coin falls head, he answers 'true', if it falls tail, he answers 'false'. Find the probability that he answers atlest 12 questions correctly.

Text Solution

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The correct Answer is:
`((1)/(2))^(20)[20C_(12)+""^(20)C_(13)+...+""^(20)C_(20)]`
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