4) A is a set of m 2 1 positive integers. Show that exists a non-empty subset BCA such that the sum of all elements of B is divisible by m. [Suggestion: Considering A= {a, a, ., am}, suppose that no sum of the form a1 + a2 + . + ak,1sksm, is divisible by m]

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A: I am attaching image so that you understand each and every step.

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