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UPSC NDA 2 2016 Mathematics Solved Paper

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Consider the following for the next three (03) items that follow:
Let a,x,y,z,b be in A.P,where x+y+z=15.Leta,p,q,r,b be in HP, where p−1+q−1+r−1=

5

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[NDA II 2016]

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Question : 18

Total: 120

What is the value of pqr?

35/243
81/35
243/35
Cannot be determined

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