Mathematics
Undergraduate
①は等差数列で、②は等比数列なんですけど、それってどうやって見分ければいいんですか?
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次の条件によって定められる数列 {a,}の一般項を求めよ。
(1) a」=1, an+1=Qn-3
(2) a1=-1, an+1+an=0
(3) a=6, an+1=Q,+n'-n+2
(4) a1=5, an+1-aォ=3·2"
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