there are 18 balls in a box: 4 red, 5 blue, and 9 green. If you
select a ball at random, what is the probability that it will be blue?

To find the probability of selecting a blue ball, we use the formula for probability:

\[
P(\text{blue}) = \frac{\text{Number of blue balls}}{\text{Total number of balls}}
\]

- The number of blue balls is 5.
- The total number of balls is \( 4 + 5 + 9 = 18 \).

Thus, the probability of selecting a blue ball is:

\[
P(\text{blue}) = \frac{5}{18}
\]

So, the probability of selecting a blue ball is \( \frac{5}{18} \).

Would you like further details or any clarification?

Here are 5 related questions:
1. What is the probability of selecting a red ball?
2. What is the probability of selecting a green ball?
3. What is the probability of selecting either a red or blue ball?
4. If you select two balls without replacement, what is the probability that both are blue?
5. If you select one ball and it is not blue, what is the probability it is green?

**Tip:** When calculating probabilities, always ensure that the total possible outcomes are correctly identified.

there are 18 balls in a box: 4 red, 5 blue, and 9 green. If you select a ball at random, what is the probability that it will be blue?

Calculate the probability of selecting a blue ball from a box containing 4 red, 5 blue, and 9 green balls. This problem introduces basic probability concepts and is ideal for students in Grades 5-7. Detailed step-by-step solution provided.

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