Questions about "sets"

Posted by James on Stack Overflow See other posts from Stack Overflow or by James
Published on 2013-10-31T21:36:29Z Indexed on 2013/10/31 21:54 UTC
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I have a test tomorrow that I am revising for and the lecturer has supplied some sample questions with no answers. I was hoping I could get some help with a couple of them. I've written what I think the answer is for them.

1. What is the type of the set {1, 2, 3}?

integer/number

2. What is the type of the set {{1}, {2}, {3}}?

integer/number (unsure what putting each number in {} does?)

3. What is the type of the set {{1}, {2}, {3}, empty}?

integer/number

4. What is the type of the set {1, {2}, 3}? — is it well typed?

integer/number

5. What is the type of the set {1, 2, john}? — is it well typed?

unsure for a mixed set. Taking a complete guess of void or empty.

Any help will be much appreciated.

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