# Quick Question about set Operation!!

• April 1st 2009, 03:25 PM
Grillakis
Question:
Let A = {a, b, c, d, e} and B = {a, b, c, d, e, f}. Find A - B and B - A?

How would I do A - B since both have similar letters besides the f in B? What I am seeing in A - B is everything in A but not in B. So would the answer be 0 for A - B? If so would I write it as {0}?
• April 1st 2009, 04:42 PM
Plato
$A\backslash B = \emptyset \;\& \;B\backslash A = \{ f\}$
• April 1st 2009, 04:53 PM
Grillakis
Quote:

Originally Posted by Plato
$A\backslash B = \emptyset \;\& \;B\backslash A = \{ f\}$

I knew what B - A was. So it would automatically be an empty set then for A - B. I gotcha now.

Thanks Plato (Clapping)