how many integers are in exactly one of the two sets?

[NileshG679]

Hi All,

This is a question from the MGMAT Guide 3, Problem set 5, #1.
A is a set of even integers, while B is a set of integers that are multiples of 3. There are 16 integers in set A, 22 integers in set B, and & integers in both sets. How many integers are in exactly one of the two sets?

I drew my double set matrix and had the setup correct just like the solution but I'm confused about exactly what the question is asking. How would someone know that when a question asks "How many integers are in exactly one of the two sets?" that we are supposed to add the value of the combination of [Set B and not in Set A] + [Set A and not in set B] = 9 + 15 = 24.

When I read a question like that, I think I should be getting two answers that are the same or something like that.

Thanks!

[RonPurewal]

hi,
this is the folder for problems from the free GMAT Prep software (from mba.com).

there's a separate folder for problems from our sources. please re-post this query in that folder.
thanks.