in a class of 25 student , 12 have taken maths,8 have taken maths but not biology.find the number of student who are taken maths and biology and the number of those who have taken biology but not maths .each student have taken either maths or biology or both?
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M+B = 8+9 = 17
B-M = 13-4 = 9
B-M = 13-4 = 9
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