Question

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Answer 1

Pt a=1,2,3,4,5,6,7,8,9,10,11 => A={12, 21, 30, 39, 48, 57, 66, 75, 84, 93, 102}

Pt a=0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23 =>B={103, 99, 95, 91, 87, 83, 79, 75, 71, 67, 63, 59, 55, 51, 47, 43, 39, 35, 31, 27, 23, 19, 15, 11}

A ∩ B={39, 75}