Prove that
(a) A number is divisible by 3 if and only if the sum of its digits is divisible by 3.
(c) The number 100x+ 10y+zis divisible by 11 if 11|x−y+z.(e.g. 11|528)
I am really bad at proving something please help
2026-04-14 11:21:46.1776165706
Number theory-Modular arithmetic
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