Practice Set 1.1 Algebra 9th Std Maths Part 1 Answers Chapter 1 Sets
Question 1
Maharashtra Board Solution
Write the following sets in roster form. i. Set of even natural numbers ii. Set of even prime numbers from 1 to 50 iii. Set of negative integers iv. Seven basic sounds of a sargam (sur)
Solution & Step-by-Step Answer:
i. A = { 2, 4, 6, 8,….} ii. 2 is the only even prime number ∴ B = { 2 } iii. C = {-1, -2, -3,….} iv. D = {sa, re, ga, ma, pa, dha, ni}
Question 2
Maharashtra Board Solution
Write the following symbolic statements in words. i. ∈ Q ii. -2 ∉ N iii. P = {p | p is an odd number}
Solution & Step-by-Step Answer:
i. is an element of set Q. ii. -2 is not an element of set N. iii. Set P is a set of all p’s such that p is an odd number.
Question 3
Maharashtra Board Solution
Write any two sets by listing method and by rule method.
Solution & Step-by-Step Answer:
i. A is a set of even natural numbers less than 10. Listing method: A = {2, 4, 6, 8} Rule method: A = {x | x = 2n, n e N, n < 5}
ii. B is a set of letters of the word ‘SCIENCE’. Listing method : B = {S, C, I, E, N}
Rule method: B = {x \ x is a letter of the word ‘SCIENCE’}
Question 4
Maharashtra Board Solution
Write the following sets using listing method. i. All months in the Indian solar year. ii. Letters in the word ‘COMPLEMENT’. iii. Set of human sensory organs. iv. Set of prime numbers from 1 to 20. v. Names of continents of the world.
Solution & Step-by-Step Answer:
i. A = {Chaitra, Vaishakh, Jyestha, Aashadha, Shravana, Bhadrapada, Ashwina, Kartika, Margashirsha, Paush, Magha, Falguna} ii. X = {C, O, M, P, L, E, N, T} iii. Y = {Nose, Ears, Eyes, Tongue, Skin} iv. Z = {2, 3, 5, 7, 11, 13, 17, 19} v. E = {Asia, Africa, Europe, Australia, Antarctica, South America, North America}
Question 5
Maharashtra Board Solution
Write the following sets using rule method. i. A = {1, 4, 9, 16, 25, 36, 49, 64, 81, 100} ii. B= {6, 12, 18,24, 30,36,42,48} iii. C = {S, M, I, L, E} iv. D = {Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday} v. X = {a, e, t}
Solution & Step-by-Step Answer:
i. A = {x | v = n², n e N, n < 10} ii. B = {x j x = 6n, n e N, n < 9} iii. C = {y j y is a letter of the word ‘SMILE’} [Other possible words: ‘SLIME’, ‘MILES’, ‘MISSILE’ etc.] iv. D = {z | z is a day of the week} v. X = {y | y is a letter of the word ‘eat’} [Other possible words: ‘tea’ or ‘ate’]
Question 1
Maharashtra Board Solution
Fill in the blanks given in the following table. (Textbook pg. no. 3)
Solution & Step-by-Step Answer: