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 Challenge
Integer:  The set of numbers ...,-3,-2,-1,0,1,2,3,…
 The Last Digit: Given a number raised to a large power, find the one's digit of the expansion. Want to Be a Millionaire?: If a bank doubles your money, how long will it take you to become a millionaire? Planning Cruises: Determine when three cruises with different lengths will leave on the same day. Consecutive Sum: Given the sum of consecutive numbers, find the least of these numbers. Minimizing Products: Find two positive integers with a given sum and which have the smallest product. Difference of Squares: Find positive integers which can be written as sum or difference of squares. Save the Princess: Help Princess Stunning find a particular perfect square number. Greatest Product: Find the greatest possible product of two natural numbers who have a particular sum. Integer Function: Find the smallest integer by substituting numbers into a fraction