# Find the probability of getting both red balls, when from a bag containing 5 red and 4 black balls, two balls are drawn, with replacement - Mathematics and Statistics

Sum

Find the probability of getting both red balls, when from a bag containing 5 red and 4 black balls, two balls are drawn, with replacement

#### Solution

The bag contains 5 red and 4 black balls.

i.e., 5 + 4 = 9 balls.

2 balls can be drawn from 9 balls with replacement in 9C1 × 9C1 ways.

∴ n(S) = 9C1 × 9C1 = 9 × 9 = 81

Let event A: Balls drawn are red.

2 red balls can be drawn from 5 red balls with replacement in 5C1 × 5C1 ways.

∴ n(A) = 5C1 × 5C1 = 5 × 5 = 25

∴ P(A) = ("n"("A"))/("n"("S"))

= 25/81

Concept: Concept of Probability
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