Răspuns :
P= cazuri favorabile supra cazuri posibile
Multiplu lui 15 : 0,15,40,45,60,75,90,105,120,135,150,165,180,195,210
P= 7 supra 224
Multiplu lui 15 : 0,15,40,45,60,75,90,105,120,135,150,165,180,195,210
P= 7 supra 224