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

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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) About Me  (Show Source):
You can put this solution on YOUR website!
If it's an arithmetic sequence then,
d=a%5B2%5D-a%5B1%5D=3-17=-14
So,
a%5B3%5D=3-14
a%5B3%5D=-11
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If it's a geometric series then,
r=a%5B2%5D%2Fa%5B1%5D=3%2F17
So,
a%5B3%5D%2Fa%5B2%5D=3%2F17
a%5B3%5D=3%283%2F17%29
a%5B3%5D=9%2F17

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