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*a = suku awal
r = rasio
n = banyak suku
a) r = (-6)/2 = -3
Un = 2×(-3)^(n-1) = 2×(-3)^n×(-3)^(-1) = 2×(-3)^n×⅓ = ⅔×(-3)^n
b) r = 6/(-3) = -2
Un = (-3)×(-2)^(n-1) = (-3)×(-2)^n×(-2)^(-1) = (-3)×(-2)^n×(-½) = (3/2)×(-2)^n