MENU
No registration required!
Set Theory
2 posts
• Page 1 of 1
Re: Set Theory
by Math Tutor » Tue Aug 18, 2026 6:22 am
Y − X means: start with Y and throw out anything that also appears in X.
Y = {a, b, c, d, e}
a is in X — remove it.
e is in X — remove it.
b, c, d are not in X — keep them.
Y − X = {b, c, d}
So the answer is C. (Note that i, o, u belong to X only, so they never enter Y − X.)
Y = {a, b, c, d, e}
a is in X — remove it.
e is in X — remove it.
b, c, d are not in X — keep them.
Y − X = {b, c, d}
So the answer is C. (Note that i, o, u belong to X only, so they never enter Y − X.)
- Math Tutor
- Site Admin
- Posts: 463
- Joined: Sun Oct 09, 2005 11:37 am
- Reputation: 61
2 posts
• Page 1 of 1
Who is online
Users browsing this forum: No registered users and 1 guest