Book Maths Puzzle Number System

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)

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Book Other Question

If the curve for a rectangular hyperbola is rotated through 45 degrees. What would the sketch of the curve look like as You have five people running for class president. How many different ways can their names be placed on the ballot expressed in algebraic terms?