Question

Ajar contains balls numbered 1 to 10. Two balls are drawn with replacement.

What is the probability that both balls are numbered 2 or less?

Answer 1

1/25

Explanation:

The number of ways that we can draw 2 balls without restriction is

10 × 10 = 100

Two balls will give you 2 or less (meaning 1) or 2×2 = 4

Four ways are possible:

• 2 and 2

• 2 and 1

• 1 and 2

• 1 and 1

4/100 = 1/25 is the probability of making this happen.