a) divizorii lui 20 = {1,2,4,5,10,20} P = 6/100 = 3/50 = 6%
b) multiplii lui 7 = {7,14,21,28,35,42,49,56,63,70,77,84,91,98} P = 14/100 = 14%
c) p.p.= {16,25,36,49,64,81} P = 6/100 = 6%
d) n = {11,2,2,33,44,55,66,77,88,99} P 9/100 = 9%
e) c.p. = { 1,8,27,64,} = 4/100 = 4%
f) N = {5, 15, 25, 35 ,45 ,50,51,......,59, 65 75 85, 95}= 19/100 = 19%