Question

3. In a school there are 20 teachers who teach Mathematics or Physics. Of these, 12 teach
Mathematics and 4 teach both Physics and Mathematics. How many teach Physics ?
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Answer 1

Answer:

12 teacher teaches physics

Step-by-step explanation:

here,20 teacher teaches mathematics or physics in that

n(M)=12

n(M&P)=4

n(M'&P)=20

n(P)=?

so we. had add all

n(p)=+n(M&P)+n(M'&P)-n(M)

=4 + 20 - 12

=24-12

=12

n(p)=12

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