One bag contains 4 white and 5 black balls. Another bag contains 6 white and 7 black balls. A ball is transferred from first bag to the second bag and then a ball is drawn from the second bag. Find the probability that the ball dawn is white.

Explanation

To solve the problem step by step, we will follow the outlined process:

### Step 1: Identify the contents of the bags
- **Bag 1**: 4 white balls and 5 black balls
- **Bag 2**: 6 white balls and 7 black balls

### Step 2: Define the events
- Let **E1** be the event that a white ball is transferred from Bag 1 to Bag 2.
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