Ques. -3

Algebra Level 4

If x2+x+1=0x^2+x+1=0, then r=125(xr+1xr)2\displaystyle \sum_{r=1}^{25} \left( x^r+\frac{1}{x^r} \right)^2 is equal to :

ω\omega is non-real cube root of unity.


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