SOLUTION: if the pattern 1 3 7 is contiued what would be the 5th term (1 3 7 ? ?)

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Question 558677: if the pattern 1 3 7 is contiued what would be the 5th term (1 3 7 ? ?)
Answer by unlockmath(1688) About Me  (Show Source):
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Hello,
Try this:
21
RJ
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