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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-0160
3 points, difficulty 1 of 3Level 9–10not yet calibrated
A sequence begins 7, 11, 15, 19, and continues with the same constant step. What is the 30th term?
PAT-02Arithmetic sequences and the nth termalso MOD-01, CFT-10

Browse the problems — Kangaroo Atlas