SOLUTION: if the third number is 17 and the second number is 3, what is the first number?

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Question 977288: if the third number is 17 and the second number is 3, what is the first number?
Found 2 solutions by Alan3354, richwmiller:
Answer by Alan3354(69443) About Me  (Show Source):
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Is this arithmetic, geometric or something else?