It is 127 = 2^7 - 1
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There are 16 decimal numbers that can be represented by 4-bits.
If the 8 bits represent a signed number, the range is usually -128 to +127. This is -27 to 27-1.
Largest 8 bit unsigned number is 11111111 binary which is the number 255 in decimal. In hexadecimal 255 is represented as FF In octal 255 is represented as 377. The related link below will help.
110 = 00012 110 - This is the number one writen in the decimal system 00012 - This is the number 1 using the binary system. Here, 4 bits are being represented. 00012 = 012
10