已知數(shù)列{an}（n為下標）的首項a1=1，an+1=3Sn(n>=1)，則下列結(jié)論正確的是：A。數(shù)列a2,a3,a4,…an…是等比數(shù)列B。數(shù)列a2,a3,a4,…an…是等差數(shù)列C。數(shù)列{an}是等比數(shù)列D。數(shù)列{an}是等差數(shù)列謝謝~~~講下思路即可~~

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題目錯AN+1=3SN如果n=11+1=3?