试题与答案

已知数列{an}的前n项和为Sn,若S1=1,S2=2,且Sn+1-3Sn+2S

题型:解答题

题目:

已知数列{an}的前n项和为Sn,若S1=1,S2=2,且Sn+1-3Sn+2Sn-1=0(n∈N*且n≥2),求该数列的通项公式。

答案:

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