Solution:
Given: a bag contains 6 red balls and 7 green balls, thus total balls = 6+7=13 balls
We have to find:
P( 2 green balls) = .........?
Any 2 balls can be selected from 13 balls in 13C2 ways and
2 green balls can be selected from 7 green balls in 7C2 ways
Thus
we use combination formula:
thus we get:
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