1.

Leta,b,c,d beanyfourrealnumbers, thena^n +b^n= c^n+d^nholdsfor anynaturalnumber n, if

Answer»

`a+b=c+d`
`a-b=c-d`
`a+b=C +d,a^2 +b^2=c^2+d^2`
`a-b-c-d,a^2 -b^2=c^2 -d^2`

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