In the equal ratio sequence {an}, Sn = a1 + A2 +... + an, A3 = S2 + 1, A4 = S3 + 1, then q is the common ratio=
A3=S2+1=A1+A2+1
A4=S3+1=A1+A2+A3+1
A4-A3=A3
2a3=a4
a4/a3=2
So the common ratio q = 2
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