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Tango (Posted on 2004-11-11) Difficulty: 2 of 5
No complicated set-up for this one! Quite simply, what number comes next and why?
2 4 6 9 11 15 20 ??

See The Solution Submitted by Jenny Turner    
Rating: 3.1429 (7 votes)

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an answer - but inelegant | Comment 1 of 10

25

consider these as pairs of numbers, distance between them is 2, 3, 4, so next must be 5 making 25


  Posted by Pete on 2004-11-11 08:47:47
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