1. D12=(1,2,3,4,6,12)
D27=(1,3,9,27)
D31=(1,31)
2. D100=(2,5,10,25,50)
3. M6=(12,18,24)
4. a) M7=(7,14,21,28,35,42,49)
b) M7=(21,28,35,42,49,56,63)
5. a) 10,20,130 (cele care au 0 la sfarsit)
b) 10,15,20,95,130(cele care se termina in 0 sau 5)
c) 6,16,20,24,86,112,130(cele care se termina in cifre pare)
d) 17