Which of the following is a geometric sequence where a1 = 4 and r = 3?

Which of the following is a geometric sequence where a1 = 4 and r = 3?

A) 4, 7, 10, 13, . . .
B) 3, 7, 11, 15, . . .
C) 4, 12, 36, 108, . . .
D) 3, 12, 48, 192, . . .


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