Răspuns:
nr prime:29,31,37,41,43,47,,51,53,59,61,67,71,73,79 in total 14 nr prime
P=14/56=7/28=1/4
nr pare:24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,68,70,72,74,76,78,80 in total 28 nr pare
P=28/56=1/2
P pentru nr impare=28/56=1/2
nr divizibile cu 9:27,36,45,54,63,72 in total 6 nr
P=6/56=3/28
