Is this a arithmetic series or geometric

log3 + log9 +log27 +...

thanks :)

log3 + log9 +log27 +... = log3 + 2log3 + 3log3 +...
This is sum of an AP with a = log 3 and d = log 3.
Not that 3,9,27,.... is a GP and
log3, log9, log27 .... is an AP