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FIND THE RADIUS OF THE CIRCLE WHOSE AREA IS EQUAL TO THE SUM OF THE AREAS OF TWO CIRCLES OF RADII 12 cm AND 5cm
Let P(C) be the power set of C. A binary operation* is defined on P(C) such that A*B=(A-B) union (B-A). Prove that phi is the identity element and A is invertible for all A belongs to P(C)