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Another brain teaser!


What number is missing from this series? 
(series a group or a number of related or similar things)

  1, 3, 7, ? , 21
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Let's think about this....
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the answer
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are you sure?
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The answer is 13!

1+2=3 
3+4=7 
 7+6=13
13+8=21

3, 7, 13, 21


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