What number comes next in th...
What number comes next in the following series 11, 17, 19, 23, 71, 73, 79, 83, ?Correct answers: 60
The first user who solved this task is Thinh Ddh.
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Rocket mailIn 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.) |