How do i find the lim of this series

[Dell]

i am given

Lim
n->∞ [nqⁿ], q is not given

the answer is apparently 0, but i cannot see how to get to that,

surely this is dependent on the value of q?? if |q|<1 --> q^∞=0
but if q>1--> q^∞=∞

where am i misunderstanding this?? does q stand for something here??

 

[Gib Z]

You are correct, so perhaps it was part of a bigger problem where |q| < 1 is already implied?