Question

In a group of 125 students 100 know Arabic, 50 know French and each student knows either Arabic or French. How many students know both

Answer 1

Answer:

25 students I hope this ans. help you my bro

Answer 2

Let A be the group of students knowing Arabic,

and F be the group of students knowing French,

n(A) = 100 , n(F) = 50 , n(A U F) = 1225

Students knowing both → (A intersection F)

(A U F) = n(A) + n(F) - n(A intersection F)

n( A intersection F) = n(A) + n(F) - n(A U F)

= 100 + 50 - 125 = 25

25 students know both.

Hope it helps!!

Thank you ✌️