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Assignment 3, Section B, Question 10: Error?

Posted by Gustav Bertram 
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Assignment 3, Section B, Question 10: Error?
June 07, 2008 04:10PM
Question 10 states:

____ is a partition of A union C:

A. {1,2,3,4}
B. {{1,2,3,4}}
C. {{1,2},{3,4}}
D. {{1},{2},{3},{4}}

According to the definition on pg 205 of E&C, the partition of X is any set of subsets (or parts) that have no elements in common, and the union of all parts is equivalent to X.

A union C = {1,2,3,4}, so answers B, C and D all fit the definition of a partition of A union C. The question therefore should probably be:

____ is NOT a partition of A union C.
Re: Assignment 3, Section B, Question 10: Error?
June 09, 2008 02:25PM
Hi there,

There are more than one correct answer, so the question will not be marked. You will get the credit.

Our apologies!
The COS101S team
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