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ISRO2015-6

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  1. ASCII encodes 128 specified characters  into seven-bit integers. (Extended ASCII uses 8 bits)
  2. Binary coded decimal (BCD) is a system of writing numerals that assigns a four-digit binary code to each digit 0 through 9 in a decimal (base-10) numeral.
  3. Extended Binary Coded Decimal Interchange Code (EBCDIC) is an eight-bit character encoding.
  4. The reflected binary code (RBC), also known as Gray code , is a binary numeral system where two successive values differ in only one bit (binary digit).

The code which uses 7 bits to represent a character is :ASCII

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