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Consider the first five terms of the following sequence.

3, 12, 48, 192, 768, ...

If the sequence defines a function, what is a reasonable domain and range of the
function?

a) Domain: (1, 2, 3, 4, 5, ...); Range: 3, 12, 48, 192, 768, ...}

b) Domain: {1, 2, 3, 4, 5, ...);
Range: all real numbers

c) Domain: all real numbers; Range: {3, 12, 48, 192, 768, ...)

d) Domain: all real numbers; Range: all real numbers