Sets and Venn diagrams

Question 1 of 10

By De Morgan's law, (A ∪ B)′ is equal to

Question 2 of 10

Given A = {x : 2 < x ≤ 7, x an integer}, n(A) is

Question 3 of 10

If U = {1, ..., 10} and A = {2, 4, 6, 8, 10}, find n(A′).

Question 4 of 10

How many proper subsets does a set with 3 elements have?

Question 5 of 10

If n(A ∪ B) = 40, n(A) = 25 and n(A ∩ B) = 7, find n(B).

Question 6 of 10

In a survey, 45 people read Daily Graphic, 30 read Times and 12 read both. If 10 read neither, how many were surveyed?

Question 7 of 10

If A ⊂ B, then A ∩ B is equal to

Question 8 of 10

If n(U) = 60, n(A) = 35, n(B) = 30 and n(A′ ∩ B′) = 5, find n(A ∩ B).

Question 9 of 10

Of 80 students, 50 study Twi, 40 study French and x study both, with 5 studying neither. Find x.

Question 10 of 10

Of 100 traders, 60 sell rice, 45 sell beans and 20 sell both. How many sell beans only?