Question

va rog dau coroana imediat va rog ex16-23

Answer 1

Pt ex 19:
X={2,3,4};Y={1,2,3,5,6,7}
Pt ex 21:
A={1,2,3,6};B={3,4,5};C={1,2,4,6}
Pt ex 22:
A={1};B={2};C={3}
Pt ex 23:
A={1,3,4,5};B={2,3,4}