SOLUTION: How can i find the first number of a sequence if the next number is 3 and the sum is 17

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Question 963553: How can i find the first number of a sequence if the next number is 3 and the sum is 17
Answer by Edwin McCravy(20056) About Me  (Show Source):
You can put this solution on YOUR website!
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That's not enough information. You must be given the number of terms,
and whether it is an arithmetic sequence or geometric sequence.