CLASS_11_MATHS_SOLUTIONS_NCERT

Class XI Chapter 1 – Sets Maths
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Question 6:
Write the following as intervals:
x : x R, 4 x 6
(i)
x : x R, 12 x 10
(ii)
x : x R,0 x 7
(iii)
(iv) x : x R,3 x 4
Solution 6:
x : x R, 4 x 6 ( 4,6]
(i)
(ii)
x : x R, 12 x 10 12, 10
x : x R, 0 x 7 [0,7)
(iii)
x : x R, 3 x 4 [3, 4]
(iv)
Question 7:
Write the following intervals in set-builder form:
(i)
3,0
6,12
(ii)
(iii) (6,12]
(iv) [ 23,5)
Solution 7:
(i)
(ii)
(iii)
(iv)
3,0 x : x R, 3 x 0
6,12 x : x R,6 x 12
(6,12] x : x R,6 x 12
[ 23,5) x : x R, 23 x 5
Question 8:
What universal set (s) would you propose for each of the following:
(i) The set of right triangles
(ii) The set of isosceles triangles
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