※ 引述《chris1 (小刀)》之銘言：
: Suppose that the probability of a student knows the correct answer
: of question #2 is q. What is the conditional probability that a
: student does not know the answer to question #2 given that he
: answers it correctly? Assume that student will randomly choose
: answers if he or she does not know the correct answer.
: (#2為五個選項的複選題)
: 我的問題是
: 解答寫P(對|不知)=1/32，但我不知道這個機率是怎麼算出來的...
: 請高手指教
五個選項
每個選項都可以選
第一個選項:選或不選
第二個選項:選或不選
第三個選項:....
.
.
.
以此類推
所以任意寫出來的答案有32種情形
但只有一個答案是對的
故是1/32
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