Tarun is standing 2 steps to the left of a green mark and 3 steps to the right of a black mark. He tosses a coin. If it comes up heads, he moved 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 stops? A: he stops at 21 coin tosses. B: he obtains three more tails than heads.

• ans a)1 as statement b is sufficient alone.
  let us consider tarun gets 2h & 5t. then he reaches the black mark(left side) in the seven moves.
• 13 years agoHelpfull: Yes(4) No(1)
• taking worst case possibity.... a is ans
  
• 13 years agoHelpfull: Yes(2) No(1)
• According to ravi agarwal in option B it is mentioned that "3 more trails". so if it is 1H 4T(3 more means 1H+3T), tarun can reach Green Mark. so Answer A is correct.
• 12 years agoHelpfull: Yes(0) No(0)