computers actually work using binary numbers. A switch off is 0, a switch on is 1. Groups of switches store bigger numbers. off,off,on,on,on,off = 001110 base2 which equals 0+0+8+4+2+0 = 14 base10
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A binary system is a special type of a number system. The binary system uses only two digits, other number systems use more.
The number 1 as a binary number is 1
There is no decimal number for the binary number 13 because 13 cannot be a binary number.
The number 160 in binary is 10100000
The number 11 in binary is 1011