Mathematics
Senior High

⑴と⑵両方わかりません!教えてください!

Answers

(1)は∑(2k-1)をk=1からn-1までとって+1してあげるだけです
(2)は15群の最初の項と最後の項を求めて、公差が1の等差数列なので、ふつうにとけますよね?

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