Question
A box holds a total of 'p' purple balls and 5 silver
balls. Two balls are drawn sequentially without replacement. The probability that both selected balls are purple is given as 3/7 . Determine the value of 'p'.Solution
ATQ,
p*(p-1)/ [(p+5)*(p+4)] = 3/7 By using optional method, (10*9)/ (15*14) = 90/210 = 3/7 p = 10
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