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
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Welcome to MSE. In order to get responses that suit your needs, please include in the body of the question your own thoughts, the effort made so far, and the specific difficulties that got you stuck. – Lee David Chung Lin Feb 06 '20 at 21:31
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You won't get any better without effort. – Feb 07 '20 at 16:26