Răspuns :
45,50,55,60,65,70,75,80,85.90.95.100,105,110,115,120,125,130,135,140,145,150......deci sunt 22
M5={45,50,55,60....,150}
n=(150-45):5+1
n=105:5+1
n=21+1
n=22 de multiplii
n=(150-45):5+1
n=105:5+1
n=21+1
n=22 de multiplii