CHAPTER : 1. SET
PRACTICE SET 1.1.
1. Write the following sets in roster method:
i) Set of even natural numbers
Ans : A = {2, 4, 6, 8, ...}
ii) Set of even prime numbers from 1 to 50
Ans : P = {2}
iii) Set of negative integers
Ans : I = {..., -3, -2, -1}
iv) Seven basic sounds of a sargam (sur).
Ans : S = {sa, re, ga, ma, pa, dha, ni}
Write the following symbolic statements in words:
3) P= { p|p is an old number}
Ans :. i) is an element of the set Q.
ii) -2 is not an element of the set N.
iii) Set P is a set of all p's such that p is an odd number.
3. Write any two sets by listing method and by rule method.
(i) Listing method:
A = {ruler, pair of compasses, protractor, set squares, divider, pencil, eraser}
Rule method :
A = {x|x is a tool of geometry box}
ii) Listing method: B = {-2, -1, 0, 1, 2, 3).
Rule method :
4. Write the following sets using listing method: i) All months in the Indian Solar Year.
Ans : A = {Chaitra, Vaishakha, Jyestha, Aashadha, Shravana, Bhadrapada, Ashwina, Kartika, Margashirsha, Pausha, Magha, Falguna}
(ii) Letters in the word 'COMPLEMENT
Ans : B = {C, O, M, P, L, E, N, T}
(iii) Set of human sensory organs.
Ans : C = {Nose, Ears, Eyes, Tongue, Skin}
(iv) Set of prime numbers from 1 to 20.
Ans : D = {2, 3, 5, 7, 11, 13, 17, 19}
v) Names of the continents of the world.
Ans :. E= {Asia, Africa, North America,
SouthAmerica, Antarctica, Europe, Australia}
5. Write the following sets using rule method.
(i) A = { 1, 4, 9, 16, 25, 36, 49, 64, 81, 100}
Ans :.
ii) B = {6, 12, 18, 24, 30, 36, 42, 48}
Ans :
(iii) C = {S, M, I, L, E}
Ans : C = {y|y is a letter in the word 'SMILE'}
(iv) D = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday}
Ans : D = {z | z is a day of the week}
(v) X = {a, e, t}.
Ans : X = {yly is a letter in the word 'eat' or 'tea'.}
