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jussike
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« on: December 22, 2008, 02:11:07 PM » |
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I am doing some university maths and need a bit help .... those two tasks:
1) (n^3 +5n) / 6 = ? I need to make a progression formula to here. For example 1*4+2*7+3*10+ ....n ( 3n+1 ) = n ( n+1 ) ^ 2
In my case, I got the right side and need to make the left one .
2) (4^n +15n -1)/ 9 = ?
Same thing here Hope you know how to do it
Whoever is able to solve those, will be respected by me for whole my life
( I need to make up the formulas and than prove them with mathematical induction, but you can skip the induction part, just try to make up the formula)
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