Equivalence classes of 'congruent mod 3' on Z:

A1 class

BRandom

CInfinite

D3 classes: [0], [1], [2]

Answer & Solution

Correct answer: D. 3 classes: [0], [1], [2]

3 classes: {..., -6, -3, 0, 3, 6, ...} = [0] [1] = ..., -5, -2, 1, 4, 7, ... [2] = ..., -4, -1, 2, 5, 8, ... Union = Z. Disjoint. 3 cosets of subgroup 3Z.

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