Question

in a class there are 50 students out of which 40 students which study mathematics and 20 students study physics find the number of students who study mathematics and physics​

Answer 1

Answer:

10 students.

Step-by-step explanation:

40 are with maths

20 are with physics

Answer 2

Answer:

The number of students who study mathematics and physics  is 10.

Given:

Total number of students in a class = 50.

Total number of students who study maths = 40

Total number of students who study physics = 20

To find:

the number of students who study mathematics and physics

Solution:

Let n(A) represent the number of students who study maths, n(B) represent physics.

$n(A \cup B)$ represent the total number of students  

$n(A \cap B)$represent the students who study both

By formula, $n(A \cap B)  = n(A) + n(B) - n(A \cup B)$

= 40 + 20 – 50

= 10.

Result:

The number of students who study mathematics and physics  is 10.