The number of different symbols is the same as the base. So the answer is 2 and the symbols are 0 and 1.
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Another name for the Binary Number System is the base-2 numeral system. In this system, numbers are represented using only two symbols, typically 0 and 1. Each digit in a binary number represents a power of 2, with the rightmost digit representing 2^0 (1), the next digit representing 2^1 (2), and so on.
The numbers used in the binary number system are 1 and 0
11b = 3d
Just as in decimal, you can put a minus sign in front. For example, if 101 (binary) is decimal 5, then -101 (binary) is decimal -5.
A power of 2. In the decimal system, we use powers of 10, in the binary system, powers of 2. Other number system use some other number as their base; for example, hexadecimal (base-16) uses powers of 16.