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Addition and Subtraction of Algebraic Expression

Let A=1,2,3...

Question

Let $A = 1, 2, 3, 4, 5 : B = 4, 5, 6, 7$ , find $A - B$

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Solution

A = {1,2,3,4,5}
B = {4,5,6,7}
Therefore, A-B= {1,2,3}

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