1 A class of 40 students was each required having three textbooks in each of Economics, Mathematics. It was revealed that 20 had Economics books, 24 had Geography books and 22 had Mathematics books. 10 had Economics and Geography books, 12 Mathematics books and 16 had two of the three books. If every student had at least one of the three books. Find how Geography and had Economics and many students had: All three books? Only Geography and Mathematics books? meration* is defined on the set of

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