Problems about arithmetic series often appear in math tests.

Understanding geometric series is important for understanding mathematics.

It's difficult to calculate the sum of this convergent series.

The harmonic series continues indefinitely, but its sum is not finite.

It's difficult to solve this formula.

He solved complex mathematical problems using his new calculator.

His calculating nature sometimes causes problems.

I am working using a spreadsheet software.

Please check the statement of account.

The Jōwa era was a time when culture particularly blossomed in Japanese history.