Question

In a school of 150 students, 80 offer French while 60 offer Arabic and 20 offer neither. How many students offer both subjects?

Answer 1

Step-by-step explanation:

first remove 20 students which prefer neither = 150 - 20

= 130

now 80 are offering french = 130-80 = 50

and 60 are offering Arabic = 50-60 = -10

it means 10 students are offering both subjects

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Answer 2

n(A u B )= n(A) + n(B) _ n(A n B)

130= 80 + 60_ n(A n B )

n(A nB) = 10 .....

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