With the first number being 1 (not zero), the 25th number is 11001 (base 2). This is 16 + 8 + 1 = 25 (in base ten). Each place value in the binary system is double the value to the right of it.
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A.N.D. Leibniz defined the binary number system.
A binary system is a special type of a number system. The binary system uses only two digits, other number systems use more.
There are two digits in the binary number system. 0 and 1
There is no decimal number for the binary number 13 because 13 cannot be a binary number.
The binary system is the name given to the base-2 number system.