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There are 6 red and 4 black balls in a b...

There are 6 red and 4 black balls in a bag. A ball is drawn at random. Find the probability that the ball drawn is red.

A

`4/7`

B

`3/7`

C

`2/7`

D

`1/7`

Text Solution

Verified by Experts

The correct Answer is:
A

Required probability
`(1/2xx15/25xx10/21+1/2xx10/25xx15/21)/(1/2xx15/25xx10/21+1/2xx10/25xx6/21+1/2xx10/25xx15/21+1/2xx15/25xx11/21)`
`=2/(1+2/5+1+11/10)=20/(11+20+4)=4/7`
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