Mathematics
Senior High
数Bの問題です！
（2）のもんだいを分かりやすく教えてほしいです！！
よろしくおねがいします🙇🏻♀️՞
基本 例題
次の数列の初項から第n項までの和Sを求めよ。
1.1, 2.4, 3.7, 4.10,
(2) 2,2+6,2+6+18, 2+6 +18 +54,
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