b=1
a+c=6
deci a={1,2,3,4,5,6} si c={0,1,2,3,4,5}
numerele fiind 115,214,313,412,511,610 = 6 nr
b=2
a+c=12
deci a={3,4,5,6,7,8,9} si c={3,4,5,6,7,8,9}
numerele fiind 329,428,527,626,725,824,923 = 7 nr
b=3
a+b=18
deci a=9 si c=9
deci nr este 939 = 1 nr
6+7+1=14 nr de forma abc
