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यदि `x=2015, y=2014` और `z=2013` है तो `x^(2)+y^(2)+z^(2)-xy-yz-xz` का मान क्या है?
A. 3
B. 4
C. 6
D. 2

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Best answer
Correct Answer - A
`= 1/2[(2015-2014)^(2)+(2014`

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