Question

In a class of 70 students 30 visited Ooty Hill stations, 40visited Horsley Hills and 10 visited both of them. How many visited at least one of the two hill stations?
Select one:
a. 60
b. 40
c. 30
d. 50

Answer 1

Answer:

a. 60

expalation du kya

Answer 2

The students who visited at least one of the two hill stations is

"option (a) 60".

Step-by-step explanation:

Let A = Students who visited Ooty Hill stations

B = Students who visited Horsley Hill stations

Given,

n(A) = 30, n(B) = 40 and n(A ∩ B) = 10

To find, n(A ∪ B) = ?

We know that,

n(A ∪ B) = n(A) + n(B) - n(A ∩ B)

∴ n(A ∪ B) = 30 + 40 - 10

= 70 - 10

= 60

Hence, the students who visited at least one of the two hill stations is

"option (a) 60".