Here's the question you clicked on:
why.math
If A = {positive integers divisible by 2} and B = {integers}, what is A ∩ B? { } {2, 4, 6, 8 …} {2, 4, 6, 8, 10} {1, 2, 3, 4, 5 …}
the "n" means everyting that they have in common;
all integers and +int/2 have all +int/2 in common
looks to be the 2nd one
thanks i think thats how it goes