Find number abcIf 874cc + 708a3 = ca82b4 find number abc. Multiple solutions may exist.
Correct answers: 21
The first user who solved this task is Djordje Timotijevic.
First U.S. telephone directoryIn 1878, the first U.S. telephone directory, listing about 50 names, was issued by the New Haven Telephone Company, in New Haven, Connecticut.