6. Write the following sets in roster form and also in set builder form:
(iii) $\{m o n t h s o f a y e a r w h o s e n a m e s b e g i n w i t h J\}$

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Solution

The set of months of a year whose names begin with J in roster form is $\{J a n u a r y, J u n e, J u l y\}$
The set of months of a year whose names begin with J in set-builder form is $\{x : x i s a s e t o f m o n t h s o f a y e a r w h o s e n a m e s b e g i n w i t h J\}$

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