A teacher takes 3 children from her class to the zoo at a time as often as she can, but…
Mathematics · JEE Advanced · NTA Exams — Permutations and Combinations
A teacher takes 3 children from her class to the zoo at a time as often as she can, but does not take the same three children to the zoo more than once. She finds that she goes to the zoo 84 more than a particular child goes to the zoo. The number of chidren in her class is :
- 12
- 10
- 60
- None of these
Answer
(B) 10
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