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```				   there are n students in a class a group of 3 goes to appughar with teacher and the same set of children doesn't go more than once .it is found that the teacher goes to appughar  84times more than a particular child find n?????
ans  n=10

```

6 years ago

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```										Dear Akhilesh
no. of times teacher goes to appughar = nC3
no. of times a particular child goes to appughar = (n-1)C2      bcoz we have to select 2 students out of n-1 students
According to question
nc3-(n-1)C2=84
after solving
(n-1)(n-2)(n-3)=504
n=10

All the bestAKASH GOYALAskiitiansExpert-IITDPlease  feel free to post as many doubts on our discussion forum as you can. We  are all IITians and here to help you in your IIT JEE preparation. Now  you can win exciting gifts by answering the questions on Discussion  Forum. So help discuss any query on askiitians forum and become an Elite  Expert League askiitian.
```
6 years ago

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