Question

if the sum of firdt m terms of an AP is the same as the sum of its first n terms show the that the sum of its (m+n) terms is zero​

Answer 1

Step-by-step explanation:

given

Sn= Sm

but for an AP this is possible only when both the first term and common difference are zero

=> a= 0

=> d= 0

=======> Sn+Sm=. 0

proved