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Atanasoff's computer was the first to use which of these methods?

Binary system
Decimal system
Hexadecimal system
Octal system

Answer

The answer is the binary system. The Atanasoff-Berry Computer (ABC), completed in 1942, was the first electronic digital computer. It used the binary system, which represents data using only two digits, 0 and 1. This made it much faster and more efficient than previous mechanical computers, which used decimal systems. The ABC also used capacitors to store data, which was a major innovation at the time.