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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
The correct answer is: 9
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. Subset of odd numbers = {9, 11, 13, 15, 17, 19} Subset of multiples of 9 = {9 , 18}