Book Maths Puzzle Algebra

You have five people running for class president. How many different ways can their names be placed on the ballot expressed in algebraic terms?

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Book Other Question

What is the difference between the largest and smallest nine digit perfect square number(formed with 0,1,2,3,..,9 with no two digits repeating) A square plate of some size is cut at four corners. Equal squares of the same size are cut and is formed as open box.If this open box carries 128 ml of oil. What is the size of the side of the plate?