The subsets of the set {w, x, y} are {w}, {x}, {y}, {w, x}, {w, y}, {x, y}, {w, x,y}, and { } (the empty subset). How many subsets of the set {w, x, y, z} contain w ?
(A) Four
(B) Five
(C) Seven
(D) Eight
(E) Sixteen
In this case you could figure out the number based on the number of combinations for 0, 1, 2, or 3 elements. This would take a long time. Maybe just write them out instead…
FREE Top Three 705+ Arithmetic Shortcuts (8-video course):
https://stan.store/yourgmatcoach
FREE Factoring Magic Video Course:
https://stan.store/yourgmatcoach/p/gmat-factoring-magic-8video-course-
