Question

please help me for this question

Answer 1

Hi ,

A = { x/x€N and 1<x<10 }

A = { 2 ,3,4,5,6,7,8,9 }

B = { x/x€N and x is one digit odd number }

B = { 1,3,5,7,9 }

U = A U B

U = { 2,3,4,5,6,7,8,9}U { 1,3,5,7,9 }

U = { 1,2,3,4,5,6,7,8,9 }

B' = U - B

= { 1,2,3,4,5,6,7,8,9 } - { 1 , 3 , 5 , 7 , 9 }

= { 2 , 4 , 6 , 8 }

cardinal number of B' = n ( B' ) = 4

Option ( 1 ) is correct.

I hope this helps you.

: )