Răspuns :

Munmncid
100b+10b+a+b=100b+10b+b
100b-100b-10b+10b+b-b=a
a=0
b=1,2,3,4,5,6,7,8,9
nr pot fi 110,220,330,440,550,660,770,880,990
bba+
     b
-------
bbb

Daca adunand b+a obtinem b rezulta ca  a = 0,  iar b poate fi orice cifra afara de 0.

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