Calculate a x b
Look at the series (156, 615, 561, a, 413, 341, 132, b), determine the pattern, and calculate a x b.Correct answers: 61
The first user who solved this task is Slobodan Strelac.
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Bicycle brakeIn 1889, a bicycle with a back-pedal brake was patented by Daniel Stover and William Hance of Freeport, Ill. (No. 418,142) . |