exam Maths Puzzle Numerical Ability

If a license plate consists of 3 letters followed by 2 numbers, how many license plates can be created without duplication? (allow all letters of the alphabet and all 10 digits to be used)

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exam Other Question

Write a mathematical argument that two lines perpendicular to the same line are parallel to each other. Please explain why (-x)^2 and x^2 are not equivalent can you give me an example? Also how do evaluate 3x^0 and (3x)^0 when x is not 0 would my results be different?