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atsign MasouuuD

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MATH PUZZLE: Can you replace the question mark with a number?
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.
If 6bab2 - 51164 = 1256c find number abc. Multiple solutions may exist.

Juan de la Cierva

Born 21 Sep 1895; died 19 Dec 1936 at age 41.Juan de la Cierva (Codorniu) was a Spanish aeronautical engineer who invented the autogiro (1923), a predecessor to the helicopter. Its rotor, mounted on a mast, was not powered but provided lift by auto-rotation. Power was provided by a forward-mounted engine and a conventional propeller. Flight was controlled by elevators, a rudder, and usually ailerons, though some roll control could be achieved by adjusting the tilt of the rotor head. Unlike the later helicopters, it could not take off vertically nor hover though it could takeoff and land in a much shorter distance, it could. However, if an autogiro lost power, it could spin safely back down to earth like a maple seed. He died in a fixed-wing plane accident.«

A guy was driving when a polic...

A guy was driving when a policeman pulled him over. He rolled down his window and said to the officer, "Is there a problem, Officer?" 
"No problem at all. I just observed your safe driving and am pleased to award you a $5,000 Safe Driver Award. Congratulations. What do you think you're going to do with the money?" 
The driver thought for a minute and said, "Well, I guess I'll go get that drivers' license." The lady sitting in the passenger seat said to the policeman, "Oh, don't pay attention to him - he's a smart butt when he's drunk and stoned." The guy from the back seat said, "I TOLD you guys we wouldn't get far in a stolen car!" 
At that moment, there was a knock from the trunk and a muffled voice said, "Are we over the border yet?"
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