6. Write the following sets in roster form and also in set-builder form:
(iv) the set of a single-digit whole numbers which are perfect squares

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Solution

The set of single-digit whole numbers which are perfect squares in roster form is $\{0, 1, 4, 9\}$
The set of single-digit whole numbers which are perfect squares in set-builder form is $\{x : x i s a p e r f e c t s q u a r e \sin g l e - d i g i t n u m b e r\}$

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