Difference between tuple and set in mdx

Question

What is the difference between tuple and set in MDX. How we can distinguish both and when we are using them.

Answer 1

Here's the another good explanation from: http://www.onlineexpert.com/elearning/user/pdf/APPLICATIONDEVELOPMENT/SQL2KOLAP/Ch08.pdf.

It's similar to Preet Sangha's answer.