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UPSC NDA I 2014 Mathematics Paper

DIRECTIONS: (For the next three (03) items that follow):
Given that C(n,r):C(n,r+1)=1:2 and C(n,r+1):C(n,r+2)=2:3

[NDA I 2014]

Question : 38

Total: 120

What is r equal to?

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