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यदि `x=997, y=998` और `z=999` है तो `x^(2)+y^(2)+z^(2)-xy-zx` का मान ज्ञात करें। |
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Answer» Correct Answer - D `x^(2)+y^(2)+z^(2)-xy-xz-yz=` `1/2[(x-y)^(2)+(y-z)^(2)+(z-x)^(2)]` `=1/2[(997-998)^(2)+(998-` `(999)^(2)+(999-997)^(2)]` `=1/2(1+1+4)=3` |
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