Let a and b be the roots of the equation x^2+x+1=0. The equation whose roots are a^19, b^7 is.A.x^2-x-1=0.B. x^2-x+1=0.C. x^2+x-1=0.D.x^2+x+1=0.

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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