
Andy C. answered 09/08/17
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Because it is an example of the definition of inductive reasoning.
https://en.wikipedia.org/wiki/Inductive_reasoning
Read that article at that link.
Ex. Spot is a dog and he has fleas.
Rover is a dog and he has fleas.
Dunkins in a dog and he has fleas.
Pepper is a dog and he has fleas.
see a pattern? What is the conclusion (About dogs?)
So the first term is 3.
The second term is 6 which is 3 more.
The third term is 9 which is 3 more.
The next term is 12 which is 3 more...
etc etc etc
I guess , dare I say, that is the pattern.