Question

If you save one penny on January 1, two pennies on January 2, three pennies on January 3, and continue this pattern for one year (not a leap year), what will be the value of your entire savings, in dollars, at the end of that one year?

Answer 1

savings = 1+2+3+4+...+365 :
\[\sum_{i=1}^{365}i\]

Answer 2

you can use Gauss formula