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Question

The probability of guessing the correct answer to a certain question is x3. If the probability of not guessing the correct answer is x3, then find x.
  1. 23
  2. 32
  3. 1
  4. 0.5


Solution

The correct option is B 32
Let P(A) be the probability of guessing the correct answer and P(B) be the probability of not guessing the correct answer.

We know that the sum of probabilities of all possible outcomes of an event is 1.

So, P(A) + P(B) = 1

x3+x3=1

2x3=1

x=32

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