NCERT Book Class 11 Maths Answers and Solutions

EXERCISE 1.1

1. (i), (iv), (v), (vi), (vii) and (viii) are sets.

2. (i) Î (ii) Ï (iii) Ï (vi) Î (v) Î (vi) Ï

3. (i) A = {–3, –2, –1, 0, 1, 2, 3, 4, 5, 6 } (ii) B = {1, 2, 3, 4, 5} (iii) C = {17, 26, 35, 44, 53, 62, 71, 80} (iv) D = {2, 3, 5}
(v) E = {T, R, I, G, O, N, M, E, Y} (vi) F = {B, E, T, R}

4. (i) { x : x = 3n, nÎN and 1 £ n £ 4 } (ii) { x : x = 2n, nÎN and 1 £ n £ 5 } (iii) { x : x = 5n, nÎN and 1 £ n £ 4 } (iv) { x : x is an even natural number}
(v) { x : x = n2, nÎN and 1 £ n £ 10 }

5. (i) A = {1, 3, 5, . . . } (ii) B = {0, 1, 2, 3, 4 } (iii) C = { –2, –1, 0, 1, 2 } (iv) D = { L, O, Y, A } (v) E = { February, April, June, September, November }
(vi) F = {b, c, d, f, g, h, j }

6. (i) « (c) (ii) « (a) (iii) « (d) (iv) « (b)

EXERCISE 1.2

1. (i), (iii), (iv)

2. (i) Finite (ii) Infinite (iii) Finite (iv) Infinite(v) Finite

3. (i) Infinite (ii) Finite (iii) Infinite (iv) Finite (v) Infinite

4. (i) Yes (ii) No (iii) Yes (iv) No

5. (i) No (ii) Yes 6. B= D, E = G

EXERCISE 1.

1. (i) Ì (ii) Ë (iii) Ì (iv) Ë (v) Ë (vi) Ì (vii) Ì

2. (i) False (ii) True (iii) False (iv) True (v) False (vi) True

3. (i) as {3,4}ÎA, (v) as 1ÎA, (vii) as {1,2, 5}ÌA, (viii) as 3ÏA, (ix) as f Ì A, (xi) as f Ì A,

4. (i) f, { a } (ii) f, { a }, { b }, { a, b } (iii) f, { 1 }, { 2 }, { 3 }, { 1, 2 }, { 1, 3 }, { 2, 3 }, { 1, 2, 3 } (iv) f

5. 1

6. (i) (– 4, 6] (ii) (– 12, –10) (iii) [ 0, 7 ) (iv) [ 3, 4 ]

7. (i) { x : x Î R, – 3 < x < 0 } (ii) { x : x Î R, 6 £ x £ 12 } (iii) { x : x Î R, 6 < x £ 12 } (iv) { x R : – 23 £ x < 5 } 

Please refer to attached file for NCERT Class 11 Maths Answers and Solutions