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Number systems are the technique to represent numbers in the computer system architecture, every value that you are saving or getting into/from computer memory has a defined number system. Computer architecture supports following number systems.

Binary number system

Octal number system

Decimal number system

Hexadecimal (hex) number system

1) **Binary Number System**-: A Binary number system has only two digits that are 0 and 1. Every number represents with 0 and 1 in this number system. The base of binary number system is 2, because it has only two digits.

2) **Octal number system**-: Octal number system has only eight (8) digits from 0 to 7. Every number represents with 0,1,2,3,4,5,6 and 7 in this number system. The base of octal number system is 8, because it has only 8 digits.

3) **Decimal number system**- Decimal number system has only ten (10) digits from 0 to 9. Every number represents with 0,1,2,3,4,5,6, 7,8 and 9 in this number system. The base of decimal number system is 10, because it has only 10 digits.

4) **Hexadecimal number system**-: A Hexadecimal number system has sixteen (16) alphanumeric values from 0 to 9 and A to F. Every number represents with 0,1,2,3,4,5,6, 7,8,9,A,B,C,D,E and F in this number system. The base of hexadecimal number system is 16, because it has 16 alphanumeric values. Here A is 10, B is 11, C is 12, D is 13, E is 14 and F is 15.

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