A and B toss a coin alternately till one of them gets a head and wins the game. If A starts the game, find the probability that B will win the game.

Explanation

To solve the problem of finding the probability that B will win the game when A and B toss a coin alternately, we can break it down step by step.

### Step 1: Understand the Game
A and B are tossing a coin alternately, starting with A. The game continues until one of them gets a head. If A gets a head, A wins; if B gets a head, B wins.

### Step 2: Determine the Winning Scenarios for B
1. **B can win on the 2nd toss:**
- A must toss a tail (probability = 1/2).
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