Question

A bag contains 3 blue, 2 white and 4 red balls. If a ball is drawn at random from the box, what is the probability of getting a blue ball?
1. 2/3
2. 4/9
3. 1/3
4. 2/9

Answer 1

Correct Answer - Option 3 : 1/3

GIVEN:

 the probability of getting a blue ball

There is a bag which contains balls of three colours. 3 balls of blue colour, 2 balls of white colour and 4 balls of red colour.

CONCEPT:

Number of ways to select ‘a’ out of ‘b’ = bCa

Probability = Number of favorable case / Total cases

CALCULATION:

Total number of balls = 3 + 2 + 4 = 9

Selecting 1 balls out of 9 balls of the bag = 9C1

Selecting 1 balls out of 3 blue balls = 3C1

∴ Required probability = 3C1 / 9C1

⇒ 3/9

⇒ 1/3

∴ The probability of getting a blue ball is 1/3