Mathematics
Grade10
Easy
Question
Which number in set A = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20} is an element in both the subset of odd numbers and the subset of multiples of 9?
- 9
- 18
- 12
- 15
Hint:
Sets are a collection of well-defined objects or elements. A set is represented by a capital letter symbol and the number of elements in the finite set is represented as the cardinal number of a set in a curly bracket {…}
The correct answer is: 9
Step 1 of 1:
We have given set A = {9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20}
Subset of odd numbers = {9, 11, 13, 15, 17, 19}
Subset of multiples of 9 = {9, 18}
So, 9 is the number that is an element in both the subset of odd numbers and the subset of multiples of 9.
Subsets are the sets whose elements are contained within another set.
