Admitere automatica Gheorghe Asachi Iasi 2018
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U(1!) = 1
U(2!) = 2
U(3!) = U(1×2×3) = 6
U(4!) = U(1×2×3×4) = U(24) =4
U(5!) = U(1×2×3×4×5) = U(120) = 0
Incepand de la 5! pana la 2018! toate au ultima cifra = 0.
⇒ U(1! + 2! + 3! + ... + 2018!) =
= U(1 + 2 + 6 + 4 + 0 + 0 + ... + 0) = U(13) = 3