Question 2 Show that the terms of a geometric progression with the first term 1 and common ratio 2 form a countably infinite set. Upload Choose a File Question 3 Show that the function listed below is one-to-one. $f: \mathbb{N} \to \mathbb{Z}$ $f(x) = \begin{cases} \frac{x}{2} & x \text{ is even} \\\\ -\frac{x-1}{2} & x \text{ is odd} \end{cases}$
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The terms of the geometric progression can be written as 1, 2, 4, 8, 16, ... We can see that each term can be obtained by multiplying the previous term by 2. So, the nth term can be written as 2^(n-1). Now, we can list all the terms as follows: 1st term: 2^0 = Show more…
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