SOLUTION: Ok so I have a sequence of 3,7,15... I need to know the sum of 100 terms in this sequence how would I go about doing so?

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Question 854100: Ok so I have a sequence of 3,7,15... I need to know the sum of 100 terms in this sequence how would I go about doing so?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
the difference is itself a sequence.
Is the difference geometric or arithmetic?
4,8,12
or is it
4,8,16
There are not enough terms to know what the pattern is.