Question

in a class 20 study maths 17 study social and 10 study maths and social studies how many students are there in a class

Answer 1

There are 47 students in the class. Because,
Student who study maths=20
Student who study social science=17
Students show study Maths and Social science both=10

So, 20+17+10 = 47 Students

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Answer 2

n(S) = n(A) + n(B) - n(A∩B) + n(A∪B)'
n(S) = 20 + 17 - 10 + 0
n(S) = 27 students