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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-0135
5 points, difficulty 3 of 3Level 3–4not yet calibrated
How many two-digit numbers have both of their digits odd?
NUM-02Digit-constraint puzzlesalso NUM-03, CNT-03

Browse the problems — Kangaroo Atlas