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1×2×3x....54+2017 calculați ultima cifra

Răspuns :

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