U=(4,5,6,7,8,9,10,11,12,13,14,15) U is the Universal set. A={x]x is a natural number and 9sx<14} B=(4,7,11,13,15} C=(4,5,6,13,14,15} Find the following: 1. A' (9,10,11,12,13,14,15) 2. BnC 3. AUC 4. (A B)

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Set Theory

Every field in the present world involves a set. The theory of sets was developed by German mathematician Georg Cantor while working on the “problems of trigonometric series”.