If x = 2015, y = 2014 and z=2013 then value of x²+y²+z²-xy-yz-zx is – McqOptions

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1.	If x = 2015, y = 2014 and z=2013 then value of x²+y²+z²-xy-yz-zx is:
A.	3
B.	4
C.	6
D.	2
Answer» B. 4

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