Question

EXAMPLE 5 Describe each of the following sets in Roster form
(i) (x:x is a positive integer and a divisor of 9)
(ii) (x:x € Z and | x | < 2)
(ii) (x : x is a letter of the word 'PROPORTION')
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Answer 1

Answer:

I){1,3,9}

ii){1}

iii){P,R,O,T,I,N}