HELP WHICH EXPRESSION

Answer:
[tex](n^{-3}) ^{6}[/tex]
Step-by-step explanation:
Using the rules of exponents
[tex](a^{m}) ^{n}[/tex] ⇔ [tex]a^{mn}[/tex]
[tex]a^{-m}[/tex] ⇔ [tex]\frac{1}{a^{m} }[/tex]
Consider
[tex](n^{-3}) ^{6}[/tex]
= [tex]n^{-3(6)}[/tex]
= [tex]n^{-18}[/tex]
= [tex]\frac{1}{n^{18} }[/tex]
The other 3 all simplify to [tex]n^{18}[/tex]