Question

यदि `x=997, y=998` और `z=999` है तो `x^(2)+y^(2)+z^(2)-xy-zx` का मान ज्ञात करें।

Answer 1

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`