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交 こう項 こう級数 きゅうすうでした
kō kōkyū sūdeshita

敬
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Noun
, 
Desu Copula

The polite past form of 交項級数

1. Was a series of alternating terms.

Past/Perfective
, 
Polite
, 
Mathematics

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交項級数でした

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