こう こう級数 きゅうすうじゃありませんでした
kō kōkyū sūja arimasendeshita

Noun
Desu Copula

The polite, past negative form of 交項級数

1. It was not a series of alternating terms.; It wasn't an alternating series.

Past/Perfective
Negative
Polite
Terminal Form
Mathematics