If a = x+y, b = x-y, c = x+2y, then a2+b2+c2-ab-bc-ca is – McqOptions

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1.	If a = x+y, b = x-y, c = x+2y, then a2+b2+c2-ab-bc-ca is
A.	4y2
B.	5y2
C.	6y2
D.	7y2
Answer» E.

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