A man wanted to enter an exclusive club did not know the password that was reqired.He waited by the door and listened.a club member knock down the door and the door man said "twelve". The member said "six" and was let in.A second member came to the door and the door man said "six".The member replied, "three" and was let in.The man thought he had heard enough and walked up to the door.The door man said, "ten". and the man replied, "five". But he was not let in.What should Have he said

