There are x black balls, x - 2 yellow balls, and x + 2 green balls in a bag A. The probability of selecting two black balls when two balls are drawn a...
Question
There are x black balls, x - 2 yellow balls, and x + 2 green balls in a bag A. The probability of selecting two black balls when two balls are drawn at random from the bag is . Find the total number of balls in the bag.