If the papers of 4 students can be checked by any one of the 7 teac...

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If the papers of 4 students can be checked by any one of the 7 teachers, then the probability that all the 4 papers are checked by exactly 2 teachers is;
(A) \( 2 / 7 \)
(B) \( 32 / 343 \)
(C) \( 12 / 49 \)
(D) None of these
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