engineering recuitment NPCIL Plant Operator Mock Test Quantitative Aptitude Algebra Quadratic Equation

If a = 213.125, b = 215.125 and c = 216.125 than find the value of a2 + b2 + c2 - ab - bc - ca =?.

1
6.25
2
7.00
3
6.125
4
5.250
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