a) 1935a4b
a,b ∈ {2,6,7,8,0}
Formam numerele: a=2 => 1935246, 1935247, 1935248, 1935240
a=6 => 1935642, 1935647, 1935648, 1935640
a=7 => 1935742, 1935746, 1935748, 1935740
a=8 => 1935842, 1935846, 1935847, 1935840
a=0 => 1935042, 1935046, 1935047, 1935048
=>20 numere
b) a905b41
a,b ∈ {2,3,6,7,8}
Se rezolva la fel ca si punctul a)
CORONITA!!!