Question

A bag contains 6 white and 4 black balls. Two balls are drawn at random. The probability that they are of the same colour is ______.

विकल्प

• `5/7`

• `1/7`

• `7/15`

• `1/15`

Answer 1

A bag contains 6 white and 4 black balls. Two balls are drawn at random. The probability that they are of the same colour is `underline(7/15)`.

Explanation:

Total number of balls = 10

Required probability = `(""^6C_2 + ""^4C_2)/("^10C_2)`

`= (15 + 6)/45 = 21/45`

`= 7/15`