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anyanavicka [17]
3 years ago
7

Find the formula for the geometric sequence 1, 5, 25, 125, .

Mathematics
1 answer:
spayn [35]3 years ago
7 0
The formula for a geometric sequence is an = a1 * r^n-1. For this problem, our formula can be an = 1 * 5^n-1. a1 is our first term, and r is the common ratio.

To check our formula, we can find the 5th term. a5 = 1 * 5^5-1. This gives us 625. If we look at our last term provided, the 4th term, 125 * 5 is 625.
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