Sequences and Series Question
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Grade 9 Sequences and Series CCSS: HSF-BF.A.2
Which of the following is the explicit formula for the geometric sequence 2, 6, 18, 54, ... ?
- an=3⋅2n-1
- an=2⋅3n-1
- a1=2;an=3⋅an-1
- a1=3;an=2⋅an-1