9
if J+ then K+ and N- so AB out
K and N can not be both + so D out
If K&L both + then O=V L=Z K=Y so C out
thus E
-- by 会员 HarrisZheng (2011/12/12 17:34:47)
quite time consuming, I guess I am not familiar with these kinds of questions at all.
-- by 会员 HarrisZheng (2011/12/12 18:36:30)