+23246 Braces, { and }, are used to represent a set of answers.
If the answers to a problem are the numbers 4 and 2, this answer can be expressed as {4, 2}.
Also, {7} means that the answer is 7.
If there is no number between the braces, you have an "empty set", and there is no answer. So: { } means that the problem does not have an answer.
+23246 Braces, { and }, are used to represent a set of answers.
If the answers to a problem are the numbers 4 and 2, this answer can be expressed as {4, 2}.
Also, {7} means that the answer is 7.
If there is no number between the braces, you have an "empty set", and there is no answer. So: { } means that the problem does not have an answer.
