Question

What set of numbers is described by
M={1, 2, 3, 7}
L={3, 7, 9}



a) {3,7}
b) {1, 2, 3, 7}
c) {1, 2, 3, 7, 9}
d) {1, 2, 3, 3, 7, 7, 9}


C?


What set of numbers is described by
E = {2x | x is an odd number}

a) {1, 3, 5, 7, 9 . . .}
b) {2, 4, 6, 8, 10, 12 . . .}
c) {2, 6, 10, 14, 18 . . .}
d) {7}
A?











Given the set
E = {2, 4, 6, 8, 10, 12 . . .}

Which of these sets are contained within it?

a) E = {e | e is any even number between 101 and 199}
b) {2}
c) {450,678,702}
d) all of the above


B?

Answer 1

Your first question is incomplete.
did you want something like M U L ??

2nd question:
E is created by doubling all the odd numbers, which of course would create even numbers.

odds = {1,3,5,7,...
double these would give us { 2,6,10,14,....}
so , do you want to re-think your answer ?

3rd one:
E is the set of all even numbers to infinity
- so for a) wouldn't that include all evens between 101 and 199) , so a) is correct
b) certainly the {2} is in it, so b) is correct
c) don't the even numbers of 450, 678, and 702 belong to the set of all even numbers ??
so c) is correct

well, how about that, they are all correct.