Teaching DSSSB PGT Mock Test 2025 Mathematics Relations and Functions

If A and B are two subsets of a set X such that n (X) = 900, n (A) = 400, n (B) = 600 and n (A∩B) = 250. Then, n (A'∩B') = ?

1
130
2
150
3
180
4
250
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