SOLUTION: 1 3 6 9 6 8 7 3 2 4 ? 6 6 4 7 2

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Question 1081021: 1 3 6 9
6 8 7 3
2 4 ? 6
6 4 7 2
Answer by ikleyn(52775) About Me  (Show Source):
You can put this solution on YOUR website!
.
4.

Or -7.

Or pi.

Or e.

Or e%5Epi.

Or pi%5Ee.

Or any other  number.

Guessing numbers for you IS NOT a mission or an aim of this site.