1.

If n∑r=0f(r)=A and ∣∣∣∣∣2rb2(2n−1)ac2(n+1)a3rx3n−1∣∣∣∣∣=f(r)where (a,b,c,x are rational numbers). Then the value of A is

Answer» If n∑r=0f(r)=A and ∣∣
∣
∣
∣
2rb2(2n−1)ac2(n+1)a3rx3n−1∣∣
∣
∣
∣
=f(r)


where (a,b,c,x are rational numbers). Then the value of A is


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