Question: 2.11 Show that an integer N is congruent modulo 9 to the sum ofits decimal digits. For example, 723 = 7 + 2 + 3

2.11 Show that an integer N is congruent modulo 9 to the sum ofits decimal digits. For example, 723 = 7 + 2 + 3 = 1 2 = 1 + 2 = 3(mod 9 ). This is the basis for the familiar procedure of â??casting 1 answer

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