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The probability of guessing the correct answer to a certain test question is $\frac{x}{6}$. If the probability of not guessing the correct answer to this question is $\frac{2}{3}$, then the value of $x$ is:
- (a)$2$
- (b)$3$
- (c)$4$
- (d)$6$
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(A) $2$