Question

In a society there are 500 families. Out of them, 350 families are viewers of channel A, 250 families views channel
B. SO families do not like to watch either. What is the number of families
who like to watch both the channels.​

Answer 1

Answer:

100 families like to watch both the channels.

Answer 2

Answer:

n(U)=500

n(A)=350

n(B)=250

n(AUB)= n(U) because there is no members of do not like to watch eaither.

now,

we know that

n(AUB)=n(A)+n(B)-n(AnB)

500=350+250-n(AnB)

n(AnB)=600-500

=100 #