Which of the following are GP? If they are in GP. Write three more terms?
3, -32, 33…….
Here first term is (a) = 3
r1 = 
r2 = 
Common ratios are equal so the given series is in GP.
a4 = a r3 = 3×(-3)3 = 3 × -27 = -81
a5 = a r4 = 3×(-3)4 = 3 × 81 = 243
a6 = a r5 = 3×(-3)5 = 3 × -243 = -729
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