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
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