Which two numbers were multiplied with the calculator? Show puzzle solution The last digit of the product must be 7. Because the last digits of the two factors can be only 2, 3, 5, 6, 8 or 9 ...
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‘Darth Grader’: A New Mathematical Way to Grade Rock ClimbsDarth Grader breaks down rock climbing routes into sections and rests, and employs an algorithm to deliver a more objective ...
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