The probability of guessing the correct answer to a certain test question is x by 12 if the probability of not guessing the correct answer to this question is 2 by 3 then x equals

Answers (1)

P(c) = x/12
P(c') = 2/3
We know that sum of the probability of an event happening and not happening is 1.
Hence, P(c) + P(c') = 1 or
x/12 + 2/3 = 1
x/12 = 1 - 2/3
x/12 = 1/3
3x = 12
x = 12/3
x = 4

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