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单选题
The probability of guessing the correct answer to a certain test question is x/12. If the probability of NOT guessing the correct answer to this question is 2/3, what is the value of x?
A
2
B
3
C
4
D
6
E
12
参考答案
参考解析
解析：
You are given that the probability of guessing the correct answer to a certain test question is 1/3, so the probability of not guessing the correct answer is 1 - (x/12). Since the probability of NOT guessing the correct answer to this question is given as 2/3, 1-(x/12) = 2/3 or 1-(2/3) = x/12. So 1/3 = x/12. Hence, x = 4.
You are given that the probability of guessing the correct answer to a certain test question is 1/3, so the probability of not guessing the correct answer is 1 - (x/12). Since the probability of NOT guessing the correct answer to this question is given as 2/3, 1-(x/12) = 2/3 or 1-(2/3) = x/12. So 1/3 = x/12. Hence, x = 4.
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