Question

find a-(a-b) if a={5,9,13,17,2}b={3,6,9,12,15,18,21,24}
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Answer 1

a-(a-b)

{5,9,13,17,21}({5,9,13,17,21}-{3,6,9,12,15,18,21,24})

={5,9,13,17,21}-{3,5,6,12,13,15,17,18,24}

={3,6,12,15,18,24}

Hope it helps you.