Which expression is equivalent ^^

Hello, amichelle86 ^^
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Explanation:
[tex] \tt \longmapsto{ \bf{ {4}^{6} . {4}^{ - 8} }}[/tex]
[tex] \tt \longmapsto{ \bf{ {4}^{6 - 8} }}[/tex]
[tex] \tt \longmapsto{ \bf{{4}^{ - 2} }}[/tex]
[tex] \tt \longmapsto{ \bf{ \frac{1}{ {4}^{2} } }}[/tex]
Answer:
[tex] \boxed{ \sf{ \frac{1}{4 {}^{2} } }}[/tex]
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