Q.1) a player tosses a coin and is to score one point for every head and two points for every tail turned up. he is to play on until his score reaches or passes

Q.1) A player tosses a coin and is to score one point for every head and two points for every tail turned up. He is to play on until his score reaches or passes n. If pn is the chance of attaining exactly n score, show that ph(Pn-1 + Pr-2) and hence find the value of p