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Each of five questions on a multiple cho...

Each of five questions on a multiple choice examination has four choices, only one of which is correct. A student is attempting to guess the answer. If the random variable X is the number of questions answered correctly, the probability that the student will get exctly three answer correct is

A

`45/512`

B

`63/64`

C

`781/1024`

D

`979/1024`

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The correct Answer is:
A
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