Question

descopera toate ntr de forma 28abc .stiind ca a +b+c =3

Answer 1

Pai:
a=0,1,2,3.
b=0,1,2,3.
c=0,1,2,3.
Trebuie grupate astfel incat sa iti dea a+b+c=3
28.012,28300, etc.

Answer 2

28abc .stiind ca a +b+c =3 adica 0+1+2=3
28 012, 28 102, 28 120, 28 201, 28 210, 28 021;