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 (Pb Patwari) Algebra

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

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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