If x = 997, y = 998 and z = 999, then the value of x²+y²+z²-xy-yz-z – McqOptions

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1.	If x = 997, y = 998 and z = 999, then the value of x²+y²+z²-xy-yz-zx is :
A.	0
B.	1
C.	-1
D.	3
Answer» E.

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