# The relation R on the set Z defined by R = {(a, b) : (a – b) is divisible by 5} divides the set Z into how many disjoint equivalence classes

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The relation R on the set Z defined by R = {(a, b) : (a – b) is divisible by 5} divides the set Z into how many disjoint equivalence classes?

a) 5

(b) 2

(c) 3

(d) 4