Two friends Alice and Bob have found an unfair coin, It has 72% chance of coming up heads. Alice & Bob plays a game with this coin. If coin comes up heads and then tails, Alice wins. If it's the reverse (tails, then heads), Bob wins. And if neither of those two things happens, the game restarts and continues until there is a winner.
What's Bob's probability of winning?
but correct ans is given 0.5?