If x= b+ c-2a , y=c+a -2b and z= a+b -2c then the value of x^2 +y^2 -z – McqOptions

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1.	If x= b+ c-2a , y=c+a -2b and z= a+b -2c then the value of x^2 +y^2 -z^2 + 2xy will be -
A.	1/2
B.	0
C.	8
D.	9
Answer» D. 9

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