已知数列{an}的前n项和Sn满足S(n+1)=(K+1)Sn+1,a1=1,a2=3.(n∈ N*,K为常数)
2个回答
S2=a1+a2=4
S1=a1=1
S2=(k+1)*S1+1
k=2
S(n+1)=3Sn+1
Sn=3S(n-1)+1
a(n+1)=3an
a1=1
an=3^(n-1)
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