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Якi з перелiчених нижче пар належать композицiї вiдношень R1 ◦ R2? R1 = {(1, a),...
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Якi з перелiчених нижче пар належать композицiї вiдношень R1 ◦ R2? R1 = {(1, a), (2, c)}, R2 = {(c, 3), (b, 4), (c, 1)}?
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