Question:If` 40%` of the people read newspaper x, 50% read newspaper Y and 10% read both the papers. what percentage of the people read neither newspaper ? 

A 10% 
B 15% 
C 20% 
D 25% 

+ Answer
C 

+ Explanation
`n(A) = 40, n(B) = 50, n(AnnnB) = 10`

`n(AuuuB) = n(A) + n(B) - n(AnnnB)`

`= (40 + 50 - 10) = 80`

    n(not A and B)

`= n(A^cnnnB^c)`

`= n(AuuuB)^c`

`= 100 - n(AuuuB)`

`= (100 - 80) = 20`

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Irin Moni

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