Question 3. Let ƒ : N → P(N) be the function defined by f(n) = {n,n+ 1,..., 2n}. (a) Find f(2) and f(3). (b) Decide whether each of the following statements is true or false giving a brief reason for each answer. (i) For all n E N, we have |f(n)| = n + 1. (ii) For all i, j e N, we have f(i) n f(j) + Ø. (iii) The range of f is a finite subset of N. (iv) Every element of the range of f is a finite subset of N.

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Question 3. Let f : N → P(N) be the function defined by
f(n) = {n,n+ 1, ..., 2n}.
(a) Find f(2) and f(3).
(b) Decide whether each of the following statements is true or false giving a brief
reason for each answer.
(i) For all n e N, we have |f(n)| = n+1.
(ii) For all i, j E N, we have f(i) n f(j) ± 0.
(iii) The range of f is a finite subset of N.
(iv) Every element of the range of f is a finite subset of N.
Transcribed Image Text:Question 3. Let f : N → P(N) be the function defined by f(n) = {n,n+ 1, ..., 2n}. (a) Find f(2) and f(3). (b) Decide whether each of the following statements is true or false giving a brief reason for each answer. (i) For all n e N, we have |f(n)| = n+1. (ii) For all i, j E N, we have f(i) n f(j) ± 0. (iii) The range of f is a finite subset of N. (iv) Every element of the range of f is a finite subset of N.
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