A bag contains 5 white balls, 7 red balls, 4 black balls and 2 blue balls. One ball is drawn at random from the bag. Find the probability that the balls drawn is
White or blue

Answer

To find the probability that the ball drawn is either white or blue, we can follow these steps:

### Step 1: Identify the total number of balls in the bag.
- We have:
- White balls = 5
- Red balls = 7
- Black balls = 4
- Blue balls = 2

**Total number of balls (NT)** = 5 (White) + 7 (Red) + 4 (Black) + 2 (Blue) = 18

### Step 2: Identify the number of favorable outcomes.
- We want to find the probability of drawing a white or blue ball.
- Number of white balls = 5
- Number of blue balls = 2

**Total favorable outcomes for white or blue** = 5 (White) + 2 (Blue) = 7

### Step 3: Calculate the probability.
- The probability (P) of drawing a white or blue ball is given by the formula:

\[ P(\text{White or Blue}) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} = \frac{7}{18} \]

### Final Answer:
The probability that the ball drawn is white or blue is \(\frac{7}{18}\).

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