Question

Please solve this:


If the sum of n term of a progression be a quadratic equation then show that it A. P. (arithmetic progress).​

Answer 1

let the an ap be a,b,c........(n terms)

sum of n terms = n/2{2a+(n-1)d}

an +n^2d/2-nd/3

clearly ,it is in in the form of quadratic equation.

Answer 2

Answer:

see attachment for ur question