Question
In a container, there are (x + 4) red balls, ‘x’
blue balls, and (x + 5) black balls. If the probability of picking two blue balls at random is (1/30), then find the value of ‘x’.Solution
According to the question, Total number of balls in the container = (x + 4 + x + x + 5) = (3x + 9) According to the question, 
Since the number of balls cannot be negative, Therefore, x = 6
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