Question

A bag contains four white and six black balls. If three balls are chosen from the bag at random, then what is the probability that all are white?
1. 1/10
2. 1/30
3. 1/25
4. 1/20
5. none of these

Answer 1

Correct Answer - Option 2 : 1/30

Given:

A bag contains four white and six black balls.

Calculation:

Probability that the first ball chosen is white = 4/10

Probability that the second ball chosen is white = 3/9

Probability that the third ball chosen is white = 2/8

Probability that all are white = 4/10 × 3/9 × 2/8 = 1/30