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Question

The probability of guessing the correct answer to certain test questions is y4. If the probability of not guessing the correct answer to these questions is 34, then the value of y is:


A

1

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B

0

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C

12

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D

14

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Solution

The correct option is A

1


Given, P(correct answer) = y4 and P(incorrect answer) = 34.

P(correct answer) = 1 - P(incorrect answer) [ P(A)+P(¯¯¯¯A) = 1]

y4 = 1 - 34

y = 1


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