Formulas you should already have memorized

lockdown22
Sat, 10 Oct 2009 00:22:34 +0000

A helpful way to solve for the problems where there are 2 sets of values, and you have to find the intersection of those 2 values is:

Total Number of members = Number of members in Group 1 + Number of members in Group 2 - Number of members common between the two.

You can just plug in the values that they give you to solve for any of the 4 terms.