Each questions is followed by two statements, A and B- Answer each questions using the following instructions.
A- He stops after 21 coins tosses. B- He obtains three more tails than heads.
Tarak is standing 2 steps to the left of red mark and 3 steps to the right of a blue mark. He tosses a coin. If it comes up heads, he moves one step to the right; otherwise he moves one step to the left. He keeps doing this until he reaches one of the two marks, and then he stops. At which mark does he stop?
A- He stops after 21 coins tosses.
B- He obtains three more tails than heads.