5, 10, 20, 40,__________
- 50
- 60
- 70
- 80
Explanation
The sequence 5, 10, 20, 40, 80, .... is an example of a geometric sequence.
5 + 5 = 10
10 + 10 = 20
20 + 20 = 40
40 + 40 = 80
The pattern is that we are always multiplying by a fixed number of 2 to the previous term to get to the next term.1
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