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Let R be the relation of congruence mod4 on Z: aRb if a-b= 4k, for some...

Let R be the relation of congruence mod4 on Z: aRb if a-b= 4k, for some k E Z.

(b) What integers are in the equivalence class of 31?

(c) How many distinct equivalence classes are there? What are they?

Repeat the above for congruence mod 5.

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