30,-10,10/3,-10/9

This is a geometric series.

A = 30 and Ar = -10. So r = -1/3 So the series is -30(1/3)^(n-1). the next 3 terms will be -10/27, -10/81, -10/243

1,-1/3,1/9,-1/27

1/81, 1/243, 1/729

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