1.

7 EA- D,7,9, 10, 13, 15) and 8- (x: x is a primemumber less than 20), en (B- A) isA 19)仅3,5,7,9,it ll, 13, 15, 17, 19)D (. 11.17, 19

Answer»

A = {3,7,9,10,13,15} B = {2,3,5,7,11,13,17,19} B-A = {2,5,11,17,19}



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