一道数学概率题求助,谁帮我分析下答题的思路

If you choose an answer to this question at random, what is the chance you will be correct?
(A) 25%
(B) 50%
(C) 60%
(D) 25%

提供国外论坛的讨论供参考:
http://flowingdata.com/2011/10/28/best-statistics-question-ever/
http://math.stackexchange.com/questions/76491/multiple-choice-question-about-the-probability-of-a-random-answer-to-itself-bein

6 个回答

这个答案就是狄仁杰出的,我元芳认为定有蹊跷。