Question

how to draw venn diagram C={x:x =2k+1,k£N} D={x:x is a factor of 21,x£N}​

Answer 1

C=2k+1

= 2(1)+1

= 2+1

=3

similarly C=also 5,7,9,11,13,15,17,19,21,.........

D=3,7,21