Where the a^b means a raised to the b power:
1111 = 2^3 + 2^2 + 2^1 + 2^0 = 8 + 4 + 2 + 1 = 15
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There are 16 decimal numbers that can be represented by 4-bits.
An integer is any whole number. For example, 4, 16, -8 are all integers. There is no decimal part. Obviously, there is no "maximum number" as these numbers continue up to infinity.
x+3 and x+4 would be consecutive integers.
the number 4 is an integer.
It is: 0+4 = 4 which is an integer or a whole number