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Question
Write the following sets in the roaster form.
A = {x | x is a positive integer less than 10 and 2x – 1 is an odd number}
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Solution
2x – 1 is always an odd number for all positive integral values of x.
In particular, 2x – 1 is an odd number for x = 1, 2, ..., 9.
Thus, A = {1, 2, 3, 4, 5, 6, 7, 8, 9}.
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