Multiple Choice Questions on If a 2017 b 2016 and c 2015 then what is the value of a2 b2 c2 ab bc ac ........ for RRB(NTPC) Exam Preparation

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Multiple Choice Questions

If a 2017 b 2016 and c 2015 then what is the value of a2 b2 c2 ab bc ac ........

Quantitative Aptitude (RRB NTPC) Algebra
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    If a=2017 , b=2016  and c= 2015 then what is the value of a2+b2+c2-ab-bc-ac

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    Explanation:

    a2+b2+c2-ab-bc-ac
    =1/2 [(a-b)2 + (b-c)2+(c-a)2]
    =1/2 [2017-2016]2 + [2016-2015]2 + [2015-2017]2
    =1/2 (1+1-4)=3

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