Question

. What are the first four terms of the geometric sequence with a t1 = 3 and tn = 2tn-1?. . A 2, 18, 54, 68. . B 3, 12, 24, 54. . C 2, 6, 18, 54. . D 3, 6, 12, 24.

Answer 1

In this geometric sequence:
t 1 = 3  ( first term ) and  r = 2 ( common ratio )
t 2 = 3 · 2 = 6
t 3 = 3 · 2² = 12
t 4 = 3 · 2³ = 24
Answer: D ) 3, 6 , 12, 24