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Find number abc

If bc6ba - 16117 = c2a7c find number abc. Multiple solutions may exist.

Correct answers: 45

The first user who solved this task is Eugenio G. F. de Kereki.

#brainteasers #math

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Edison patent

In 1888, Thomas A. Edison was issued a patent for a "Telephone-Transmitter" (No. 278,044).

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