Question

Scrie toate nr naturale pare de 4 cifre care au suma cifrelor egală cu 4

Answer 1

_____

U SZU = ?

_____

U SZU ∈ { 1 003; 1 030; 1 300; 1 012; 1 021; 1 102; 1 120; 1 210; 1 111;

2 002; 2 020; 2 200; 2 011; 2 101; 2 110; 3 001; 3 010; 3 100. }

Answer 2

1030, 1300, 1102, 1012, 1210, 1120, 2110. 2002, 2020, 2200, 3100, 3010.