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Topic: Math (name the sequences) (Read 446 times) |
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Jeremy
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Math (name the sequences)
« on: Apr 8th, 2003, 10:59am » |
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I was in math today and we had a little throw back to the algebra days when we had to find an equation given a series of numbers. Try to devise an equation for the following sequences given the number of the sequence (n), starting with n = 1.
eg. 1,2,3,4,5... would be "n"
2, 4, 6, 8, 10... would be "2n".
While these aren't quite riddles, i think you can still get clever with them.
1) 2, 5, 8, 11, 14...
2) 1, -1/3, 1/5, -1/7, 1/9...
3) 1, 1/2, 3, 1/4, 5, 1/6 ...
4) 2, 0, 2, 0, 2...
5) 1, 2, 1/9, 4, 1/25, 6, 1/49...
//Title changed by Icarus
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| « Last Edit: Sep 20th, 2003, 9:41pm by Icarus » |
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aero_guy
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Re: Math
« Reply #1 on: Apr 8th, 2003, 11:29am » |
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1) 3n-1
2) (-1)n-1/(2n-1)
3) n((-1)^(n-1))
4) 1+(-1)(n-1)
5) n-.5+1.5*(-1)^n
nice progression, though it makes the later ones easier than they would be without the first several.
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| « Last Edit: Apr 8th, 2003, 11:31am by aero_guy » |
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