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Each of the total fice questions in amul...

Each of the total fice questions in amultiple choice examination has four choices, only one of which is correct.A student is attempting to guess the amswer . The renadom varible X is the number of question answerred correctly. What is the probability that the student will giveat least one correct answer ?

A

`45/512`

B

`63/64`

C

`781/1024`

D

`979/1024`

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The correct Answer is:
C
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