teacher: if i gave you 2 rabbits, and another 2 rabbits and another 2, how many will you have?
pappu: seven sir.
teacher: no, listen carefully. if i gave you 2 rabbits, and another 2rabbits and another 2, how many will you have?
pappu: seven.
teacher: let me put it to you differently. if i gave you 2 apples, and another apples and another 2, how many will you have?
pappu: six. teacher: good. now if i gave you 2 rabbits, and another 2 rabbits and another 2, how many will you have?
pappu: seven!
teacher: where do you get seven from?
pappu: because i have already got one at home.