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If the papers of 4 students randomly distributed for checking among 7 teacher, then the probability that all the 4 papers are checked by exactly 2 teachers is n/m where n, m are natural number and `HCF(n,m)=1`. Then number of positive divisiors of `(n+m)` is

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The correct Answer is:
D
`P(E)=21.(16-2)//7.7.7.7`
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