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13 (mod 3) is the remainder of division of the number 13 by 3.
So, 13 (mod 3) is 1 (13 = 4*3 + 1, therefore, 13 (mod 3) = 1 (mod 3) ).
32 (mod 3) is the remainder of division of the number 32 by 3.
So, 32 (mod 3) is 2 (32 = 10*3 + 2, therefore, 32 (mod 3) = 2 (mod 3) ).
Therefore, 13 - 32 (mod 3) = 1 - 2 (mod 3) = -1 (mod 3) = 2 (mod 3).
ANSWER. 13 - 32 (mod 3) = 2 (mod 3).