Mathematics

Saniya

20 June, 09:15

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)