ChaseDream

标题: [求助]新人求解大全A-7 [打印本页]

作者: ruppina 时间: 2006-7-15 07:16
标题: [求助]新人求解大全A-7

有谁能帮忙解释一下思维过程吗?

If A, then B.

If B, then C.

If C, then D.

If all of the statements above are true, which of the following must also be true?

(A) If D, then A.

(B) If not B, then not C.

(D) If D, then E.

(E) If not A, then not D.

答案说是C 可是那跟B和E的区别在哪里呢?

谢谢

作者: mbz 时间: 2006-7-15 07:50

always remember this: if A ---> B, then Not B ----> not A

Now in the statement above, since A ---> D, So Not D ----> Not A

Hence, C is the answer

作者: gonghao 时间: 2006-7-18 22:58
逆否命题

欢迎光临 ChaseDream (https://forum.chasedream.com/)