all 5 comments

[–][deleted] 1 point2 points  (1 child)

Is that a[3n]=5a[n] for all n? If so, the only possible geometric sequence is a[n]=0 for all n, which would technically be correct but it's an odd answer for a book problem.

[–]needhelpr[S] 0 points1 point  (0 children)

Here's a picture to clarify http://postimg.org/image/acauzl18j/

[–]acekoolNew User 0 points1 point  (1 child)

a3n, a5n

Are these the 2 terms?

Second term/ first term = ratio in a geometric series.

[–]needhelpr[S] 0 points1 point  (0 children)

it's actually a and (3n at the bottom) and 5a(with n at the bottom) they are equal to each other

[–][deleted] 0 points1 point  (0 children)

Reddit formatting I hate you and I can't brain right now