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Describe the following sets in Roster form: {x:x is a two digit number such that the sum of its digits is 8}

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Describe the following sets in Roster form: 

{x:x is a two digit number such that the sum of its digits is 8}

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Numbers which have sum as 8 are = 17,26,35,44,53,62,71,80 

⇒ Roster form will be {17,26,35,44,53,62,71,80}.

by (10 points)
Nice but please explain how it came also
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