Question

If U=(1, 2,3,4,5,6,7,8,9,10) X=(1, 2,3,6,7) Y=(1, 3,6,8) and Z=(5, 8,9) find the elements of each set
1 .X u Y=. 6.X" =
2. Y n Z=. 7. Z" =
3. Y"=. 8. _ =
4. X - Z=. 9. X G Y =
5.( X n Z) =. 10. (X U Y) " =

Answer 1

Answer:

Number of elements in A=10

Number of subsets of A containing exactly two elements

= Number of ways we can select 2 elements from 10 elements

10

C

2

=

2

10×9

=45

∴ Number of subsets of A containing exactly two elements =45