Mathematics
Senior High
（２）の解き方が分かりません。
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(2)数列 {an} の奇数番目の項の和 atastas+……tagg を求めよ。
(1) この数列の一般項 an を求めよ。
466*
次の問いに答えよ。
(2) aitas+ast…………+a99
=2+3+7+11+………+195
49(3+195)
=2+
2
=2+4851=4853
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