How do I come out with 3 general formulae for the following sequences?

Question

O. 2, 8, 26, 80, 242,...
O. 1, 3, 7, 15, 31, 63,........
O. 0, 2, 6, 12, 20, 30, ....

I'v given up cause both Arithmetic and Geometric sequences dont work

Answer 1

For the second series it would be 2^n-1; for the third it is n^2-n; for the third it is 3^n-1.

Answer 2

The third sequence increases by 2, then 4, then 6, then 8, then 10... and so on.

Answer 3

that's relaxing to word...which you think approximately wikipedia as an expert on Hindu non secular concerns. do you be attentive to that even apes like me can edit a wiki web site and make you have self assurance in monkey enterprise ??? Coming to the question...What Prr says is powerful and what you're saying is likewise suited. in between the puranas i remember reading this approximately Hiranyaksha and Hiranyakashyapa. yet dont remember which one or the place..yet i'm particular it grew to become into not a Dharma Shastra texts ..yet a purana. traditionally some families evaluate the 2d born of the twins to be elder. Shoumn has given an evidence in that query. It has got here approximately in case of one of our cousins. yet not all families persist with this practices. some traditionally orthodox ones do it. otherwise as a well-known acceptance, people who come out first is elder. As i examine the solutions interior the hyperlink lower back...i discover which you have additionally given a similar answer as Shoumn. So now issues are very sparkling !!! this question is an results of jealousy. you're disenchanted which you didnt get the final answer regardless of quoting from an 'authority' (wikipedia).... LOLOL.

Answer 4

first one is An = 3(An-1 aka previous term)+2
second is is An = 2(An-1)+1
third one is something....I'm stumped on this one

Answer 5

I just solved it. Now do your own homework jackasss