0, 1, 2, 3, 4, 5, 6, 7, 8, 9 in decimal number system . A total of 10 basic symbols or numbers are used. Binary number system is used in computer design. The numbers 0 and 1 used in binary numbers can be easily expressed with the help of electrical signals. The electrical signal is expressed by on and off when the electrical signal is on. Electronic circuits are easier to design because of the two conditions in the binary system. However, decimal numbers can be converted to binary and used in computers.