Question

neither
In a town 30% families own a phone and
own a car and 60% families own both
a phone or a car 2000 families own both
a car and a phone find the total number of the
Families in the town.​

Answer 1

Answer:

Correct option is

A

All (a), (b) and (c) are correct.

Let A be the set of people who own phone and B be who own a car

p(A)=

100

25

​

, p(B)=

100

15

​

p(A

′

∩B

′

)=

100

65

​

and n(A∩B)=2000

⇒p(A∪B)

′

=

100

65

​

⇒p(A∪B)=

100

35

​

------(1)

p(A∪B)=p(A)+p(B)−p(A∩B)

⇒p(A∩B)=

100

5

​

----(2)

if x be the total no. of people then

100

5

​

x=2000

∴x=40000 -----(3)

from (1), (2) and (3)

All (a),(b) and (c) are correct.

Hence, option A.

Step-by-step explanation: