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If the papers of 4 students randomly đis...

If the papers of 4 students randomly đistributed for checking among 7 teachers, then the probability that all the 4 papers are checked by exactly 2 teachers is `n i m` where `n, m` are 'natural numbers and `H C F(n, m)=1`. Then number of positive divisors of `(n+m)` is

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