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A teacher takes three children from her class to a zoo at a time, but she does not take the same three children to the zoo more than once. She finds that she went to the zoo 84 times more than a particular child has gone to the zoo. The number of children n her class is a. `12` b. `10` c. `60` d. none of these

A

12

B

10

C

60

D

None of these

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