Mathematics, 22.08.2021 19:50 lacybyrd

In a class of 80 students, 45 are good in math,15 are good in both math and english,13 are good in both math and psychology,16 are good in both english &physchology ,20are good in physchology and 9 are good in all of the three .how many of them are good in mathematics

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In a class of 80 students, 45 are good in math,15 are good in both math and english,13 are good in b...