Răspundeți rapid am nevoie acuma
![Răspundeți Rapid Am Nevoie Acuma class=](https://ro-static.z-dn.net/files/d0c/2390012b88d0ec806c7018889fef79e7.jpg)
1.b)
2.M={2,5,8,11,14,17,20,23}=> d)8
3.card(AuB)= card A+card B- card(A intersectat B)
notatie: intersectat= U intors
15=125+287-x
15=412-x
x=412-15
x=397 (card A inters. B)