If A={1, 2, 3, 4}, then the number of the subsets of A that contain the element 2 but not 3, is?a.24b.16c.8d.4
Question
If A={1, 2, 3, 4}, then the number of the subsets of A that contain the element 2 but not 3, is?
- a. 24
- b. 16
- c. 8
- d. 4
Solution
The set A={1, 2, 3, 4} has 4 elements. We are looking for subsets that contain the element 2 but not 3.
This means we are essentially looking at a "new" set {1, 2, 4} of 3 elements (we've removed the 3 from consideration).
The number of subsets of a set with n elements is 2^n.
So, the number of subsets of our "new" set is 2^3 = 8.
Therefore, the number of subsets of A that contain the element 2 but not 3 is 8.
So, the answer is c. 8.
Similar Questions
Let A and B be two sets containing four and two elements respectively. Then the number of subsets of the set A × B, each having at least three elements is :
How many subsets of the set {1, 2, 3, 4} that contain 3?Select one:a.9b.3c.8d.16
If A = {1, 2, 3, 4, ……19, 20}, how many subsets of A are possible such that the product of all the elements of the subset is even?
Let S={1,2,3,5,7,10,11}. The number of non-empty subsets of S that have the sum of all elements a multiple of 3, is _____ .
A set with 4 elements has exactly 16 subsets.Group startsTrue or FalseTrue, unselectedFalse, unselected
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.