Question 503508: If I have the following numbers:
2,6,12,20,30,42...
I can see the relationship between the numbers:
+4 +6 +8 +10 +12
+2 +2 +2 +2
What kind of sequence is this? (arithmetic/geometric etc)
Thank you!
Answer by MathLover1(20850)   (Show Source):
You can put this solution on YOUR website!
The two main types of series/sequences are  and  . Some sequences are  of these.
It’s important to be able to identify what type of sequence is being dealt with.
And series is one where   is equal the one before it   number. For example: 5, 10, 15, 20, … Each term in this sequence equals the term before it with  added on.
In contrast, a  is one where each term equals the one before it  by a   . An example would be 3, 6, 12, 24, 48, … Each term is equal to the prior one multiplied by  .
so, it's of these
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