Question

what is the sum of the sequence 46+47+48+49+...+115

Answer 1

46+47+48+49+115= 305

Answer 2

46+(n-1)1=115

46+n-1*1=115

46+n-1=115

n+45=115

n=70

Plug back into equation to check.

46+(70-1)1=115

46+69=115