if x #1 4. Let f(x)={ x-1 Which of the following statements, I, II, III, are true? [2 if x = 1 I. lim f(x) exists. II. f(1) exists. III. f(1) = 2 a. only I b. only II c. I and III d. I, II and III e. I and II

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A: Explanation of the answer is as follows

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A: Let's find. 

Q: 4

A: NOTE: Refresh your page if you can't see any equations. . use the factor formula 

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A: use property of determinant to prove this.

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A: Solution is provided below

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A: