alleryEquivalence 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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