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Question
Find, if the following sets are singleton sets:
A = {x : 7x – 3 = 11}
Solution
A = {x : 7x – 3 = 11}
7x -3 = 11
⇒ 7x = 11 + 3
⇒ 7x = 14
⇒ x = `(14)/(7)` = 2
∴ A = {2}
Hence given set A is a singleton set.
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