In number system modern method of representing numbers symbolically is based on positional notations.
In this method, each number is represented by a string of symbols where each symbol is associated with a specific weight depending upon its positions. The total number of different symbols which are used in a particular number system is called the base or radix of the system and the weight of each position of a particular number is expressed as a power of the base. When a number is formed with the combination of the symbols, each symbol is then called a digit and the position of each symbol is referred to as the digit position.
Thus if a number system has symbols starting from 0, and the digits of the system are 0, 1, 2, ….. (r  1) then the base or radix is r. If a number D of this system be represented by
D = d₀ d₀ ……. d₀…….. d₁ d
then the magnitude of this number is given by
Where each d₀ ranges from 0 to r  1, such that
0 ≤ d₀ ≤ r  1, i = 0, 1, 2 ...... (n  1).
The digit at the extreme left has the highest positional value and is generally called the Most Significant Digit, or in short MSD; similarly, the digit occupying the extreme right position has the least positional value and is referred to as the Least Significant Digit or LSD.
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