Just A SIMPLE question

This is a very interesting question related to mathematic concept which my coursemate showed to beh beh, haha.

Question:
One day, you reach an island where there is 2 kind of people living on the island.

1st type : KNIGHT (only will tell the truth)
2nd type : KNAVE (only will tell lies)

You meet with 2 people on the island who are A and B.

A say : "I'm not knight, B is knight.
Then,
B say : "Ya, i'm knight."

So, who is knight and who is knave?? Can u figure it out?

Post ur answer, name, and ur reason at our comment box.
hehe, enjoy it, i will tell u the correct answer!


BEH BEH (橙精灵, happymemoirs） =)