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

A

`(12)/(49)`

B

`(6)/(49)`

C

`(9)/(49)`

D

`(15)/(49)`

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The correct Answer is:
b
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