Let X be the universal set for sets A and B. If n (A)  200 , n (B)  300 and n (A  B)  100 ,

Let X be the universal set for sets A and B. If n (A)  200 , n (B)  300 and n (A  B)  100 , then n (A'B') is equal to 300 provided n (X) is equal to
(a) 600
(b) 700
(c) 800
(d) 900
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