CLASS_11_MATHS_SOLUTIONS_NCERT

Class XI Chapter 1 – Sets Maths
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Solution 7:
A
B
C
x : xis a natural number 1, 2,3, 4,5...
x : xis an even natural number 2,4,6,8...
x : xis an odd natural number 1,3,5,7,9...
x : xis a prime number 2,3,5,7...
D
(i)
A B x : x is a even natural number
B
(ii) : is an odd natural number
(iii)
A C x x C
A D x : xis a prime number
D
(iv) B C
(v)
(vi)
B
D
2
C D x : xis odd prime number
Question 8:
Which of the following pairs of sets are disjoint
(i)
1, 2,3, 4
a, e, i, o,
u
(ii)
x : xis a natural number and 4 x 6
and
c, d, e,
f
and
x : xis an even integer and x : xis an oddinteger
(iii)
Solution 8:
(i)
x : xis a natural number and 4 x 6 4,5,6
Now,
1, 2,3, 4
1, 2,3, 4 4,5,6 4
Therefore, this pair of sets is not disjoint.
(ii) a, e, i, o, u c, d, e,
f e
Therefore, a, e, i, o, uand c, d, e,
f are not disjoint.
(iii)
x : xis an even integer x : xis an odd integer
Therefore, this pair of sets is disjoint.
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