Question

In a bag, there are three different colour balls namely red, yellow and white. The sum of the number of yellow and red balls in the bag is equal to the number of white balls in the bag. The probability of picking two red balls from the bag is (3/38). If the total number of red, yellow and white balls in the bag is 20, then find out the number of yellow balls in the bag.

A 6
B 5
C 4
D Either 4 or 6
E 8
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