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.
Answers
Answered by
2
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:
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