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Zorica Bera

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The computer chose a secret code (sequence of 4 digits from 1 to 6). Your goal is to find that code. Black circles indicate the number of hits on the right spot. White circles indicate the number of hits on the wrong spot.
NUMBERMANIA: Calculate the number 8586 using numbers [9, 1, 3, 9, 67, 884] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.
If 63486 + caab6 = 13bc4a find number abc. Multiple solutions may exist.

Pierre-Louis-Georges Du Buat

Born 23 Apr 1734; died 17 Oct 1809 at age 75.French hydraulic engineer who derived formulas for computing the discharge of fluids from pipes and open channels.

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