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List the elem...

Question

List the elements of the following sets in Roster form:
(i) The set of all positive integers which are multiples of 7.
(ii) The set of all prime numbers less than 20.

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Solution

(i) The set of all positive integers which are multiples of 7 in roster form is ${7, 14, 21, 28, . . .}$
(ii) The set of all prime numbers less than 20 in roster form is
${2, 3, 5, 7, 11, 13, 17, 19}$

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