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177 problems, every one written from scratch, every wrong answer carrying the mistake that produces it. 708 explanations in all.

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NUMNumber & Arithmetic
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KA-0169
3 points, difficulty 1 of 3Level 11–12not yet calibrated
What is the remainder when 7 to the power 100 is divided by 5?
NUM-06Remainders and modular cyclesalso NUM-07, PAT-03

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