What a winning combination?
[5714] What a winning combination? - 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. - #brainteasers #mastermind - Correct Answers: 30 - The first user who solved this task is Nílton Corrêa De Sousa
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What a winning combination?

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.
Correct answers: 30
The first user who solved this task is Nílton Corrêa De Sousa.
#brainteasers #mastermind
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The old formula doesn't work

The old formula doesn't work
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First airplane stamp design

In 1912, the world's first stamp to depict an airplane (a biplane) was issued in the U.S., to be available at Post Offices on 1 Jan 1913. (This came six years prior to the first U.S. airmail stamps.) It was a 20-cent Parcel Post stamp, with carmine rose red ink, titled “Aeroplane Carrying Mail,”part of a series of twelve stamps designated for parcel post. On 24 Aug 1912, Congress had authorized the U.S. Post Office to enter the parcel post business to improve service for rural areas poorly served by private delivery companies. Four stamps in the series showed workers (including 3c. "Railway Postal Clerk," 4c. "Rural Carrier" in a horse-drawn wagon). Four more had transportation methods (including a 5c. "Mail Train," 10c. "Steamship and Mail Tender," 15c."Automobile Service"), and others showed industries.«
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