12. Let f : [0, 1] → R be differentiable and suppose that |f'(x)| < 1 for every r € [0,1]. Then, there A. is at least one c € [0,1] such that f(c) = c. B. are two numbers c and c2 such that f(c) = c; for i = 1, 2. C. is exactly one c E [0, 1] such that f(c) = c. D. is at most one c € [0, 1] such that f(c) = c.

Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
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The question is attached below. These are practice test question for an undergrad entrance exam. Please provide an intuition using a graph. There is no need to prove it only an intuitive reasoning (with figure) will be enough. 

I think the answer should be D. Thank you.

12. Let f : [0, 1] → R be differentiable and suppose that |f'(x)| < 1 for every r E [0, 1].
Then, there
A. is at least one c e [0, 1] such that f(c) = c.
B. are two numbers c and c2 such that f(c) = c; for i = 1, 2.
C. is exactly one c € [0,1] such that f(c) = c.
D. is at most one c e [0, 1] such that f(c) = c.
Transcribed Image Text:12. Let f : [0, 1] → R be differentiable and suppose that |f'(x)| < 1 for every r E [0, 1]. Then, there A. is at least one c e [0, 1] such that f(c) = c. B. are two numbers c and c2 such that f(c) = c; for i = 1, 2. C. is exactly one c € [0,1] such that f(c) = c. D. is at most one c e [0, 1] such that f(c) = c.
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