If A = {1, 2, 3, 4}, B = {4, 5, 6}, C = 1, 3, 5}
Find (i) A - B, (ii) B - C, (iii) C - A

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Solution

A = {1,2,3,4}, B = { 4,5,6} and C = {1,3,5}

(i) A $-$ B
It contains all those elements of A which do not belong to B.
Hence, A $-$ B = {1,2,3}

(ii) B $-$ C
It contains all those elements of B which do not belong to C.
Hence, B $-$ C = {4,6}

(iii) C $-$ A
It contains all those elements of C which do not belong to A.
Hence, C $-$ A = {5}

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