Question

) a) If A is a subset of the set B, then A∩B =-----

b) Represent the above set A∩B by venn diagram

c) In a school there are 20 teachers who teach Mathematics

or Physics , of these 12 teach mathematics , 12 teach physics

How many teach both the subjects ?​

Answer 1

Answer:

n(AnB) = 4 teachers both the subject