Question

Determinati toate numerele de forma abc stiind ca abc-ab-c=153

Answer 1

abc-ab-c=153
abc-c-ab=ab0-ab=ab(10-1)=9·ab=153
ab=153/9=17
ab=17
a=1
b=7
c∈{0,1,2,3,4,5,6,7,8,9}
abc∈{170, 171, 172, 173,..., 179}