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

Question 972260: if 17 is the first number and 3 is the second number then what is the third number???
Found 2 solutions by Fombitz, Alan3354:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
If it's an arithmetic sequence then,

So,

.
.
.
If it's a geometric series then,

So,

Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Not enough info.
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