1. P and Q are two sets. If n (P∪Q) = 45 and n (P) = 25 and n (Q) = 35, then n (P∩Q) is A) 10
B) 12
C) 20
D) 15
2. If I is the set of positive integers and P={x:x∈I, x^2<10 and x≠0}, then
A) P = {0,1}
B) P = {0,1,2,3}
C) P = {1.2,3}
D) P is an infinite set
3. Simplify (1-y^2) / (y-y^2)
A) 1/y
B) (1-y) / y
C) (1+y) / y
D) 1 / (1-y)
+1
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Home » Mathematics » 1. P and Q are two sets. If n (P∪Q) = 45 and n (P) = 25 and n (Q) = 35, then n (P∩Q) is A) 10 B) 12 C) 20 D) 15 2. If I is the set of positive integers and P={x:x∈I, x^2<10 and x≠0}, then A) P = {0,1} B) P = {0,1,2,3} C) P = {1.