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What decimal number is equivalent to binary number 121?
That's not a binary number ! Binary numbers can only use the digits 1 and 0.
What's the largest decimal number that be represented with 5 binary digits?
It is 31.
How many binary digits are required to count to decimal 100?
7 digits
What are the advantages and disadvantages of binary code decimal?
Advantage of binary over decimal: information can be recorded and stored in any dichotomous variable: magnetised or not magnetised (most electronic media), pit or no pit (optoelectronic media CDs/DVDs). For decimal it would be necessary to store as 10 different levels of magnetisation or depths of pits. Not so easy to make such a system error-free. Advantage of decimal over binary: fewer "digits" required. Every ten binary digits (1024 values) can be replaced by just a shade more than three decimal digits (1000 values). So the number of digits to be stored is less than a third.
What does it mean base 10 system?
This is just decimal, the number system that we usually use. Decimal means that there are 10 digits (0-9) as opposed to other number systems such as binary, which has only two digits.
