[SOLVED] what does "n" mean?

Allan89a · #1 $Old$ October 24th, 2009, 02:21 AM

For instance, if A = (a,c,d,e) and B= (a,b) and C= (b,c,e,f), then what is n((A -B) - C)? And n(A ∩ B ∩ C)? What is this n?? Thanks for any help

xalk · #2 $Old$ October 24th, 2009, 04:08 AM

Quote:

Originally Posted by Allan89a $View Post$

For instance, if A = (a,c,d,e) and B= (a,b) and C= (b,c,e,f), then what is n((A -B) - C)? And n(A ∩ B ∩ C)? What is this n?? Thanks for any help

nA usually denotes the No of elements in the set,for example nA in the above problem is 4
And n( $A\cap B\cap C$ ) = 0

Allan89a · #3 $Old$ October 24th, 2009, 08:03 AM

Yeah, I figured it out later on, but thanks!