Răspuns:
Explicație pas cu pas:
A = {24, 25, 26, ...., 80}
multimea A are 57 elemente
numere prime in multimea A : 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79
a) P = 13/57
numere pare in multimea A: 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
b) P = 29/57
numere impare in multimea A: 25, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53, 55, 57, 59, 61, 63, 65, 67, 69, 71, 73, 75, 77, 79
c) P = 28/57
numere divizibile cu 9 in multimea A: 27, 36, 45, 54, 63, 72
d) P = 6/57
