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Find number abc

If 30843 - a0a4c = 20c9b find number abc. Multiple solutions may exist.

Correct answers: 18

The first user who solved this task is Nasrin 24 T.

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Rocket mail

In 1928, Austrian Friedrich Schmiedl launched his first experimental rocket. The design he first used was not successful. However, by 9 Sep1931, he started the world's first official postal rocket-mail service between two Austrian towns. A parachute provided a safe landing. His rocket-mail service continued until 16 Mar 1933 when laws prohibited the civilian use of explosives (including his rocket fuel.)

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