3 + 6 + 12 + 24 + …
1 + 2 + 3 + 4 + …
2 + 4 + 2 + 4 + …
The number of seats in each row forms.
5 + 7 + 10 + 14 + …
Halley’s Comet can be seen from Earth every 75 years. What type of sequence is formed by the years Halley’s Comet can be seen?
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