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Diophantine Equations

Pro Problems > Math > Number and Quantity > Number Theory > Diophantine Equations

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Strings of red lights and green lights on my Christmas tree - a Christmas word problem
A diophantine equation - quadratic in two variables
A fictional coin only valid in the state of Maine. Can you find its value in cents?
System of equations in two unknowns with squares, sums, and differences
A single equation in x and y - find all possible ordered pairs of integers that are solutions

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Christmas Tree Lights, Integers M and N, Sum and Difference, The Lobstah Coin, Twenty-Three

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