Mathematics
Senior High
数Bです。答えは2ｎ²-ｎでした。どこから間違ってますか?
4. 次の数列{an}の一般項を求めよ。
(1) 1, 6, 15, 28, 45, 66,
5 9 13
an=
11
SAMA
4-1
Σ 4K + 1
2
n
1.4-1
+4+2
34(41
4n
1
2(n-1n+h-1
2n-2nth-1
2n²-n---
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