A bag contains a black ball, a red ball and a green ball, all the balls are identical in shape and size. A ball is drawn from the bag without looking into it. What is the probability that the ball drawn is:
a red ball

Answer

To solve the problem of finding the probability of drawing a red ball from a bag containing a black ball, a red ball, and a green ball, we can follow these steps:

### Step 1: Identify the total number of balls in the bag.
The bag contains:
- 1 black ball
- 1 red ball
- 1 green ball

**Total number of balls = 1 + 1 + 1 = 3**

### Step 2: Identify the number of favorable outcomes.
We want to find the probability of drawing a red ball. There is:
- 1 red ball in the bag.

**Number of favorable outcomes (drawing a red ball) = 1**

### Step 3: Calculate the probability.
The probability (P) of an event is given by the formula:

\[ P(\text{Event}) = \frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} \]

In this case, the probability of drawing a red ball is:

\[ P(\text{Red ball}) = \frac{1}{3} \]

### Final Answer:
The probability that the ball drawn is a red ball is \( \frac{1}{3} \).

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