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 ?
n(A) = 40, n(B) = 50, n`(A nn B)` = 10
n `(A uu B)`= n(A) + n(B) - n`(A nn B)` = 40 + 50 - 10 = 80
`:.` percentage reading either r both newspaper = 80%
Hence , percentage reading neither newspaper = (100 - 80)% = 20%.
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