exam Maths Puzzle Numerical Ability

6-g(g-7)6-8g

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exam Other Question

If n is a positive integer,then x^-n = 1/x^n ??? (always, sometimes or never)
Same thing with this one :

if n is zero then x^-n is 1 ???? (always, sometimes, never)

Tha How would I evaluate (15-5)divided by [(12 divided by 2*2)-2]?