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 Description  
 Binary System:  The base 2 number system that uses the digits 0 and 1.
For Example:

The binary number 1011 can be represented as a decimal number by (1 x 23) + (0 x 22) + (1 x 21) + (1 x 20). This simplifies to (1 x 8) + (0 x 4) + (1 x 2) + (1 x 1) = 8 + 0 + 2 + 1 = 11. This means that the binary number 1011 is equivalent to 11 in the decimal number system.