Tell whether the sequence 5,10,20,40,80,... is geometric

Jadon Camacho

Jadon Camacho

Answered question

2022-11-14

Tell whether the sequence 5,10,20,40,80,... is geometric

Answer & Explanation

mignonechatte00f

mignonechatte00f

Beginner2022-11-15Added 13 answers

You can tell if f ( n + 1 ) f ( n ) = some number that is the same for all the numbers in the series
10 5 = 2
20 10 = 2
40 20 = 2
80 40 = 2
All these terms have a common ratio of 2. That means, if you take the next term up and divide it with the first term, you will always get this common ratio if it's a geometric series.
Since when you divide them, you always get the common ratio, that means the series is geometric.

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