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[" 7.If the papers of "4" students can b...

[" 7.If the papers of "4" students can be checked by anyone "],[" of the "7" teachers,then the probability that all the "],[4" papers are checked by exactly "2" toachers,is equal "],[" to "],[[" a."(12)/(49)," b."(6)/(49)," c."(9)/(49)," d."(15)/(49)]]

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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.12/49 c.32/343 d.none of these

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. 12//49 c. 32//343 d. none of these

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. 12//49 c. 32//343 d. none of these

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. 12//49 c. 32//343 d. none of these

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 2//7 b. 12//49 c. 32//343 d. none of these