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Two sequences 2016-08-20
Ting pose la question :
The first four terms of a sequence are 4, 20, 56 and 120. By comparing with the nth term of sequence 1,5,14 and 30 which is 1/6n(n+1)(2n+1), find a formula for nth term. Can you precisely show out how you do this questions ( with the steps please)
Penny Nom lui répond.
The nth term of a sequence 2012-10-19
Emily pose la question :
I don't understand how to do this question:
Nth term for 9, 7, 5, 3, 1
Is there a fast way to do nth term for this question? Or in fact any question?

Penny Nom lui répond.
nth term 2008-10-22
jen pose la question :
what is a nth term and how do i find the nth term of any sequence
Penny Nom lui répond.
Finite differences 2003-02-10
Jenny pose la question :

I need to find a formula that will work with any number.
I am finding the volume of a 3d cross- shape. Here are my results so far:

Term Number      0   1    2    3     4      5
nth term         1    7   25   63   129    231
1rst diff           6   18   38   66     102
2nd diff              12    20   28   36
3rd diff                  8     8    8

I can't seem to find a formula that will work with any number. Any help would be much appreciated.

Penny Nom lui répond.

 
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