riddle!!!!!!!! (hard one) see if u can answer it?

Question

there are 3 brothers andrew, jack & tom,
everybody thought he was smarter than the others, so they asked their fourth brother nathan, to test them,
so he told them as follows in a separate room u each will get a red or blue dot on your forehead, when u get out of the room if u see atleast one red dot on somebody elses forehead u must put up your hand, then whoever says what color dot is painted on his forehead wins.
he then painted all red dots, when they got out of the room of course everybody raised their hands, but after deep concentration andrew the smartes one said : "i have a red dot" , how could he be so sure?

Answer 1

Coz if Andrew had a blue dot, Jack would think:"If both Andrew and I have blue dots, Tom wouldn't put up his hand" and Tom would think:"If both Andrew and I have blue dots, Jack wouldn't put up his hand", so both Jack and Tom would be quick to say:"I have a red dot!" But they didn't say that, so Andrew doesn't have a blue dot, but a red one..

Answer 2

because all three of them have raised their hands, so the chances are greater that he has a red dot.

Answer 3

Because people kept coming to him wanting to buy liquor? Get it??? red dot.

Answer 4

cuz they all have their hand up.and he saw they all two red dots.

Answer 5

becuz the other two raised their hands

Answer 6

becuase the other two raised their hands

Answer 7

everyone had their hands up

he was looking in a mirror

Answer 8

one of his brothers was wearing glasses and he saw his reflection