Answers

2016-07-19T21:39:40+08:00
Given:
an=54
a1=2
r=?
Formula:
an=a1(r)ⁿ⁻¹
54=2(r)⁴⁻¹
54=2(r)³
------------
2    2
27=r³
3³=r³
∛3³=∛r³
3=r
Geometric Sequence: 2,6,18,54
0