SOLUTION: A student argues that A={1{1}} has only one element. How do you respond?

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Question 841393: A student argues that A={1{1}} has only one element. How do you respond?

Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The student has used confusing set notation.
You use commas to separate the elements.
Additionally, the curly brackets denotes the collection of elements in the set.
Adding another set of curly brackets only causes confusion.
If the student wants to denote a set of other sets, you would write.
A={B,C,D} where B={1},C={0,1}, and D={1,2} are other sets, you wouldn't write
A={{1},{0,1},{1,2}}
So if that was the students intent, she would write A={1,B}