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The probability that a student is not sw...

The probability that a student is not swimmer is `1//4`. Then the probability that out of five students atleast four are swimmers is

A

`18//31`

B

`1//88`

C

`81//128`

D

`18//181`

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The correct Answer is:
C
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DIPTI PUBLICATION ( AP EAMET)-THEORETICAL DISTRIBUTIONS-EXERCISE 1 (CHOOSE THE CORRECT ANSWER FROM THE ALTERNATIVE 1,2,3 OR 4 GIVEN )
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