Find the total number of terms in a G.P., if its first term is 12, last term is 2916 and the common ratio is 3.
Explanation:
Tn = arn–1
2916 = 12 × (3)n–1
243 = (3)n–1
35 = (3)n–1
∴ n – 1 = 5
∴ n = 6
Hence, option (b).
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