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A problem in mathematics is given to two...

A problem in mathematics is given to two students A and B. The probability of solving the problem is `(3)/(4) and (5)/(7)` respectively. If the probability that the problem is solved by both of them is `(2n)/(21)`, then the value of n is -

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CHHAYA PUBLICATION-PROBABILITY-SAMPLE QUESTIONS FOR COMPETITIVE EXAMS
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