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

Let X be the universal set for sets A and B. If n (A) = 200, n (B)

1.	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.	500
B.	600
C.	700
D.	800
Answer» D. 800

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