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How do I find a1 for the geometric sequence down below Sn = 1640, r = 3, n = 8

How do I find a1 for the geometric sequence down below Sn = 1640, r = 3, n = 8
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2 votes
How do I find a1 for the geometric sequence down below
Sn = 1640, r = 3, n = 8

User ChiragBhalgami
by
8.3k points

1 Answer

4 votes

Answer:

a1=1640/2187

Explanation:

Geometric sequence formula: an=a1 r^n-1

s8=1640=a1 3^8-1

1640=a1 3^8-1

1640=a1 3^7

1640=a1 2187

a1=1640/2187

User Jambaman
by
8.0k points
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