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There are two digits in the binary number system. 0 and 1
It is the binary number 1010100. A binary number represents exponential values of 2, in this case 7 digits for 64, 32, 16, 8, 4, 2, and 1 84 = 64 + (0x32) + 16 + (0x8) +4 + (0x2) + (0x1) = 1010100
56 in binary is 111000. Unlike the decimal number system where we use the digits.
The binary number 10101 represents 21.
Computers do much of their processing in binary. Hexadecimal is used as a kind of shortcut (easier to read for humans): each hexadecimal digit represents four binary digits.