Help with comparison tests (calculus)?

Reticon

New member
Hello,

So I've been working on some homework for a test tomorrow and I'm having some serious trouble recognizing if I should use a comparison test.

take for example this...
(the summation of n=1 to infinity of...) n-1 / n4^n

I don't know what I should be looking for if I DO need to even compare this...
what do you guys look for?
like...

should it be 1 / 4^n?
 
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