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Two balls are selected from a box containing 2 blue and 7 red balls. What is the probability that at least one ball is blue?

A

`2/9`

B

`7/9`

C

`5/12`

D

`7/12`

Text Solution

Verified by Experts

The correct Answer is:
A
No. of blue balls = 2
No. of red balls = 7
Total no. of balls = 9
Required probability
= P(one ball is blue) + P(both ball is blue)
`= 2/9 xx 7/8 + 2/9 xx 1/8 = 14/72 + 2/72 = 16/72 = 2/9`
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