Question
A bag contains B red balls and 9 purple balls. If two balls are drawn at random, one after the other without replacement, and the probability of drawing both red balls is 3/10, determine the value of
A bag contains B red balls and 9 purple balls. If two balls are drawn at random, one after the other without replacement, and the probability of drawing both red balls is 3/10, determine the value of
B.
Using the optional method: 
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