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Akhilesh Gandhi Grade: 11
        

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

Answers : (1)

AKASH GOYAL AskiitiansExpert-IITD
419 Points
										

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 best

AKASH GOYAL
AskiitiansExpert-IITD

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6 years ago
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