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What came first? (Posted on 2002-12-04) Difficulty: 3 of 5
Find the first number in the following series. (there may be more than one answer?)

?, 2 ,3 , 8, 30, 144, 840, 5760, 45360...

See The Solution Submitted by Cory Taylor    
Rating: 3.0000 (8 votes)

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Interesting property | Comment 6 of 12 |
2*(1 1/2) = 3
3*(2 2/3) = 8
8*(3 3/4) = 30
30*(4 4/5) = 144
144*(5 5/6) = 840
840*(6 6/7) = 5760
5760*(7 7/8) = 45360

i guess that means that shows that the 2nd term = a*(0 0/1) = 0*a = 2

and so a (first term) is undefined

  Posted by Dulanjana on 2002-12-06 18:59:24
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