Problems about arithmetic series often appear in math tests.

My hometown is a prefecture-level city.

Understanding geometric series is important in learning the basics of advanced mathematics.

His family's crest tells the story of ancient history.

He cannot read the letter because he is illiterate.

He found a solution to the problem through a cycle of answering his own questions.

He found a solution by repeatedly answering his own questions.

He is a specialist in that field.

He studied under a famous painter.

The family crest of my house is Nantenmon.