Which of the following are GP? If they are in GP. Write three more terms?

-2, -6, -18 ……..

Here first term is (a) = -2

r₁ =

r₂ =

Common ratios are equal so the given series is in GP.

a₄ = a r³ = -2×3³ = -2 × 27 = -54

a₅ = a r⁴ = -2×3⁴ = -2 × 81 = -162

a₆ = a r⁶ = -2×3⁵ = -2 × 243 = -486