# Three easy maths question. (number theory) Need help with proper deduction!

**Question description**

1. Prove that 72 | 1020 + 8

2. Find the smallest positive integer that is divisible by 10, 11, 12, 13, 14, 15, 16 (each of them)?

3. Prove that a and b (integers) materialize 7 | 10a + b, if 7 | 10b + 2a.

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