my friend ask me this question....that - There is a bank guard. every man who wants to come inside the bank needs password. so the 1st man came....guard said "6" the man said "3" and he entered.....then the second man came...the guard said "12" the man said "6" and he also entered...and the 3d man came.....the guard said "8" the man said "4" and he does not entered....why????it is so confusing....so pls give your opinion.....