I have never really done sets before and I am trying to understand the notations etc. Any how would I be correct in assuming that where it says x:x is exactly divisible by 3 and x:x is exactly divisible by 7 that it means that its a set that consists of all the numbers in set A that are divisible by 3 , and by 7?
The set is read “set of all x such that x is exactly divisible by 7”.
So does that mean that the set of all x is a? And that set C is those in A that divide exactly by 7?
Originally Posted by Plato
No, the universe is not .
Originally Posted by monkeyhead
So C is all numbers between 1 and 25 that divide exactly by 7?
Better put as: The set of all integers from 1 to 25 exactly divisible by 7.