**How to Represent a Set in Roster Set Builder and Descriptive Forms ?**

Here we are going to see how to represent a set in roster set builder and descriptive forms.

**Question 1 :**

Represent the following sets in Roster form.

(i) A = The set of all even natural numbers less than 20.

**Solution :**

The given set will contain even natural numbers lesser than 20.

A = {2, 4, 6, 8, 10, 12, 14, 16, 18}

(ii) B = {y : y = 1/2n , n ∈ N, n ≤ 5}

**Solution :**

B = {y : y = 1/2n , n ∈ N, n ≤ 5}

If n = 1, then y = 1/2

If n = 2, then y = 1/4

If n = 3, then y = 1/6

If n = 4, then y = 1/8

If n = 5, then y = 1/10

B = { 1/2, 1/4, 1/6, 1/8, 1/10 }

(iii) C = {x : x is perfect cube, 27 < x < 216}

**Solution :**

27 is the value of 3^{3}, 216 is the value of 6^{3}

C = {4^{3}, 5^{3}}

C = {64, 125}

(iv) D = {x : x ∈ Z, –5 < x ≤ 2}

**Solution :**

D = {-4, -3, -2, -1, 0, 1, 2}

**Question 2 :**

Represent the following sets in set builder form.

(i) B = The set of all Cricket players in India who scored double centuries in One Day Internationals.

**Solution :**

B = {x : x is an Indian player who scored double centuries in One Day International}

(ii) C = {1/2, 2/3, 3/4, ..........}

**Solution :**

By observing the given set, the denominator is 1 greater than the numerator.

C = {x : x = n/(n + 1) where n ∈ N}

(iii) D = The set of all tamil months in a year.

**Solution :**

D = {x : x is the set of all tamil months in a year.}

(iv) E = The set of odd Whole numbers less than 9.

**Solution :**

E = {x: x is the set of odd Whole numbers less than 9}

**Question 3 :**

Represent the following sets in descriptive form.

(i) P = { January, June, July}

**Solution :**

P = The set of English months starting with J

(ii) Q = {7, 11, 13, 17, 19, 23, 29}

**Solution :**

Q = the set of prime numbers between 5 and 31.

(iii) R = {x : x ∈ N, x < 5}

**Solution :**

R = The set of natural numbers less than 5.

(iv) S = {x : x is a consonant in English alphabets}

**Solution :**

S = The set of consonants in English alphabets

After having gone through the stuff given above, we hope that the students would have understood, "How to Represent a Set in Roster Set Builder and Descriptive Forms".

Apart from the stuff given in this section, if you need any other stuff in math, please use our google custom search here.

HTML Comment Box is loading comments...

**WORD PROBLEMS**

**HCF and LCM word problems**

**Word problems on simple equations **

**Word problems on linear equations **

**Word problems on quadratic equations**

**Area and perimeter word problems**

**Word problems on direct variation and inverse variation **

**Word problems on comparing rates**

**Converting customary units word problems **

**Converting metric units word problems**

**Word problems on simple interest**

**Word problems on compound interest**

**Word problems on types of angles **

**Complementary and supplementary angles word problems**

**Markup and markdown word problems **

**Word problems on mixed fractrions**

**One step equation word problems**

**Linear inequalities word problems**

**Ratio and proportion word problems**

**Word problems on sets and venn diagrams**

**Pythagorean theorem word problems**

**Percent of a number word problems**

**Word problems on constant speed**

**Word problems on average speed **

**Word problems on sum of the angles of a triangle is 180 degree**

**OTHER TOPICS **

**Time, speed and distance shortcuts**

**Ratio and proportion shortcuts**

**Domain and range of rational functions**

**Domain and range of rational functions with holes**

**Graphing rational functions with holes**

**Converting repeating decimals in to fractions**

**Decimal representation of rational numbers**

**Finding square root using long division**

**L.C.M method to solve time and work problems**

**Translating the word problems in to algebraic expressions**

**Remainder when 2 power 256 is divided by 17**

**Remainder when 17 power 23 is divided by 16**

**Sum of all three digit numbers divisible by 6**

**Sum of all three digit numbers divisible by 7**

**Sum of all three digit numbers divisible by 8**

**Sum of all three digit numbers formed using 1, 3, 4**

**Sum of all three four digit numbers formed with non zero digits**