Răspuns:
38801,37811,36821,35831,34841,33851,32861,31871,30881
Explicație pas cu pas:
3a8b1
a, b cifre
a,b ∈{0,1,2.....9}
3 + a + 8 + b + 1 = 20 => a + b + 12 = 20 => a + b = 20 - 12 => a + b = 8
a = 0 => b = 8
a = 1 => b = 7
a = 2 => b = 6
a = 3 => b = 5
a = 4 => b = 4
a = 5=> b = 3
a = 6 => b = 2
a = 7 => b = 1
a = 8 => b = 0
38801,37811,36821,35831,34841,33851,32861,31871,30881
