It's much easier to evaluate the sums first using Arithmetic Series.
Determine which of the following two numbers is larger, and explain your reasoning:
a.1,000,000x(1+2+3+4+...+1,000,001)
b.1,000,001x(1+2+3+4+...+1,000,000)
I've tried multiplying the number (1,000,000) times the corresponding numbers (1,2,3,4) and did the same for 1,000,001. However, I'm not sure if I have done that right...