u(1 x 2 x 3 x ..... ...x54 + 2017) =?
Numarul 1 x 2 x 3 x ..... ...x54 are ca ultima cifra pe zero =>
u(1 x 2 x 3 x ..... ...x54 + 2017) = 7
10 x 20 x 30 x 40 x 50 => 6 zerouri
4 x 5 => 1 zero
14x15 = > 1 zero
24x25 => 2 zerouri
34x35 => 1 zero
44x45=> 1 zero =>
In total numarul .... 1 x 2 x 3 x ..... ...x54 are 12 de zero
