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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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Solution I got it (I think.....) | Comment 6 of 10 |

2,4,6,9,11,15,20,40,51,55,60,90,101,105,110,150

Using Roman numerals, the sequence uses only two symbols ie.

II, IV, VI, iX, XI, XX   XL, LI......


  Posted by joe on 2004-11-13 10:55:45
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