Could you explain restrictions to the domain and range of a sequence.(arithmetic and geometric sequence) please...

Question

anonymous · Answer

@perl

anonymous · Answer

been stuck on this for a while. :(

perl · Answer

For me it is easiest to think of sequences as functions with domain of integers. 
for example the sequence f(n) = 2*n,  lets assume the domain is n=1,2,3,..
that gives us the sequence
2*1, 2*2, 2*3, 2*4, ... 2*n , ...

anonymous · Answer

okay, so here are my numbers 3,6,9 and 4,8,16

anonymous · Answer

still there @perl?

perl · Answer

yes

perl · Answer

3,6,9  can be represented by the rule  f(n) = 3*n
the domain will be 1,2,3 in that case

anonymous · Answer

have any ideas? i'm very lost...

anonymous · Answer

oooohhhh, i get it thank u soooo much @perl :)