Question

In a school there are 20
teacher who teach
Mathematics or physics of these 12 teach
mathematic and 4 teach both physics and Mathematics.
How many teacher teach physics?​

Answer 1

Answer:

Number of teachers who teach math or physics =n(M∪P)=20

Number of teachers who teach math = n(M)=12

Number of teachers who teach math and physics =n(M∩P)=4

Find : Number of teachers who teach physics =n(P)=?

Solution :

n(M∪P)=n(m)+n(P)−n(M∩P)

20=12+n(P)−4

20−12+4=n(P)

n(P)=12

hence 12 teacher teach the physics

Answer 2

Answer:

10 teachers it is simple

Step-by-step explanation:

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