A) 12
B) 8
C) 16
D) None of these
Correct Answer: A
Solution :
[a] Let\[n\,(P)=\]Number of teachers in Physics \[n\,(M)=\]Number of teachers in Maths \[\because \] \[n\,(P\cup M)=n\,(P)+n\,(M)-n\,(P\cap M)\] \[\therefore \] \[20=n\,(P)+12-4\] \[\Rightarrow \] \[n\,(P)=12\] |
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