Answers

2016-02-16T11:10:49+05:30
The answer is...
215+305= 520
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2016-02-16T14:51:04+05:30
N(AUB) = n(A) + n(B) - n(A n B)
410 = 285 + 195 - n(AnB)
n(AnB)  = 285 + 195 - 410
             =  70

n(AnB)' = U - n(AnB)
            = 500 -  70  = 430
By Demorga's Theorem
  n(A' U B') = n(A n B)'
                 =  430


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