Question

Find the sum to n terms of 2+10+30+68+130.........?

Answer 1

hunt down the pattern.

Answer 2

easy way ...plug the series in WA or OEIS ... but i suggest you look for difference or difference of difference.

Answer 3

wat is WA and OEIS

Answer 4

http://www.wolframalpha.com/
http://www.oeis.org/

Answer 5

i want to do manually

Answer 6

any other way

Answer 7

yeah ... look for the difference of the terms,
also difference of the difference
also try dividing by 2 , 3 ,4 , 5 ...

the basic sequence are the arithmetic, geometric, oar arithmetic-geometric sequences ...

Answer 8

K th order Diffrence....is cumbersome.....

Answer 9

find the first few ...

Answer 10

3 rd order difference is Constant...

Answer 11

write it down ... i haven't worked it out.

Answer 12

hm...Is there any other way to tackle this

Answer 13

at least i can't tell by looking ...

Answer 14

if you say the third order difference is constant ... then it must be sequence of sums of Arithmetic sequence.

Answer 15

third differences are 6