The explicit formula for the geometric sequence 3, 15, 75, 375,… is

1.	The explicit formula for the geometric sequence 3, 15, 75, 375,… is _______
A.	26! 3n-1
B.	3 * 5n-1
C.	3! * 8n-1
D.	7 * 4n-1
Answer» C. 3! * 8n-1

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