exam Maths Puzzle Numerical Ability

Simplify without negative exponents or decimal answers.
x^n-1/x^n

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exam Other Question

input output
36 9
72 9
24 1
18 0

need to determine the function for each output Having trouble finding the area of two triangles. Here is my question.

What is the ratio of the area of triangle ABC to area of triangle BCE, where AD is the perpendicular bise