Răspuns:
Explicație pas cu pas:
caz posibile...0,1..9....total 10
a)...caz fav...1;3;5;7;9...5cazuri ....P=5/10=1/2
b) caz fav 4;5; 6;7;8;9...6 cazuri...P=6/10= 3/5
c) caz fav 0;1...7...total 8cazuri .....P=8/10=4/5
d) caz fav 0;3;6;9..toal 4...P=4/10=2/5
as simple as that!!!