Advertisements
Advertisements
Question
Write the following sets in Roster form:
C = {x : x is composite number and 5 ≤ x ≤ 21}
Solution
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.
APPEARS IN
RELATED QUESTIONS
Write the following sets in roster (Tabular) form :
A2 = {x : x2 - 4x -5 = 0}
Write the following sets in set-builder (Rule Method) form :
B5 = {-5, -4, -3, -2, -1}
Write the following sets in Roster form:
The set of letters in the word ‘MEERUT’
Write the following sets in Roster form:
A = {x : x = y + 3, y ∈N and y > 3}
List the set of letters of the following words in Roster form.
PARALLELOGRAM
Consider the following sets A = {0, 3, 5, 8}, B = {2, 4, 6, 10} and C = {12, 14, 18, 20}.
18 ∈ C
Consider the following sets A = {0, 3, 5, 8}, B = {2, 4, 6, 10} and C = {12, 14, 18, 20}.
6 ∉ A
Represent the following set in Roster form
B = `{y : y 1/(2"n"), "n"∈"N", "n" ≤ 5}`
Represent the following set in set builder form
C = `{1/2, 2/3, 3/4, ...}`
Represent the following set in descriptive form
S = {x : x is a consonant in English alphabets}
