jj Question.

skycrash

just see jj
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"天道酬勤,第一次,轻松过关."
6.有个数列，特征是：若T在此数列，则T+2必定在此数列。已知-1在此数列。则必有：
1）1在此数列
2）-3在此数列
3）5在此数列
My answer: 1+2+3
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but I think it should be 1+3,
if -1 is the first one, -3 won't in it.
Who can confirm it?

sandwolf

逻辑思维：有Ｔ必有Ｔ+２，但是未必有Ｔ+２就有Ｔ。
因而有-1并不见得非得有-3。

[em09][em09][em09][em09][em09][em09]

skycrash

Thank you for your formal explanation.
I think he made a mistake here. That's probably why he only get 49 in math.

yiyuan05

这题应该是1，3正确。