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प्रश्न
Write the following sets in Roster form:
C = {x : x is composite number and 5 ≤ x ≤ 21}
उत्तर
C = {x : x is composite number and 5 < x < 21}
5 ≤ x ≤ 21 means x = 5, 6, 7, 8, 9, 10 ......, 21
But we are given that x is a complete number
∴ x = 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21
∴ Roster form of the given set C = {6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21}
Note: Composite numbers : The natural numbers (greater than 1), which are not prime, are called composite numbers.
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