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Let f, g : [0, 1] → [0, 1] be functions. Let R(f) and R(g) be the ranges of f and g, respectively.
Which of the following statements is (are) true?
  • a)
    If f(x) ≤ g(x) for all x ∈ [0, 1], then sup R(f) ≤ inf R(g)
  • b)
    If f(x) ≤ g(x) for some x ∈ [0, 1], then inf R(f) ≤ sup R(g)
  • c)
    If f(x) ≤ g(x) for some x,y ∈ [0, 1], then inf R(f) ≤ sup R(g)
  • d)
    If f(x) ≤ g(x) for all x,y ∈, then sup R(f) ≤ inf R(g)
Correct answer is option 'B,C,D'. Can you explain this answer?
Most Upvoted Answer
Let f, g : [0, 1] [0, 1] be functions. Let R(f) and R(g) be the ranges...
Solution:

Definitions:

  • R(f) is the range of function f

  • sup R(f) is the supremum of the range of function f

  • inf R(g) is the infimum of the range of function g

  • f(x) g(x) means that function f is less than or equal to function g for all x in the domain [0,1]



Explanation:

  • If f(x) ≤ g(x) for all x [0, 1]:


    • sup R(f) ≤ sup R(g) because the supremum of f's range is less than or equal to the supremum of g's range

    • inf R(f) ≤ inf R(g) is not necessarily true since it is possible for f to have a smaller range than g even though f is less than or equal to g


  • If f(x) ≤ g(x) for some x in [0, 1]:


    • inf R(f) ≤ inf R(g) because the infimum of f's range is less than or equal to the infimum of g's range

    • sup R(f) ≤ sup R(g) is not necessarily true since it is possible for g to have a larger range than f even though f is less than or equal to g for some x in [0, 1]


  • If f(x) ≤ g(x) for some x and y in [0, 1]:


    • inf R(f) ≤ inf R(g) because the infimum of f's range is less than or equal to the infimum of g's range

    • sup R(f) ≤ sup R(g) because the supremum of f's range is less than or equal to the supremum of g's range


  • If f(x) ≤ g(x) for all x and y in [0, 1]:


    • inf R(f) ≤ inf R(g) because the infimum of f's range is less than or equal to the infimum of g's range

    • sup R(f) ≤ sup R(g) because the supremum of f's range is less than or equal to the supremum of g's range




Therefore, the correct statements are B, C, and D.
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Let f, g : [0, 1] [0, 1] be functions. Let R(f) and R(g) be the ranges of f and g, respectively.Which of the following statements is (are) true?a)If f(x) g(x) for all x [0, 1], then sup R(f) inf R(g)b)If f(x) g(x)for some x [0, 1], then inf R(f) sup R(g)c)If f(x) g(x) for some x,y [0, 1], then inf R(f)sup R(g)d)If f(x) g(x)for all x,y, then sup R(f) inf R(g)Correct answer is option 'B,C,D'. Can you explain this answer?
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Let f, g : [0, 1] [0, 1] be functions. Let R(f) and R(g) be the ranges of f and g, respectively.Which of the following statements is (are) true?a)If f(x) g(x) for all x [0, 1], then sup R(f) inf R(g)b)If f(x) g(x)for some x [0, 1], then inf R(f) sup R(g)c)If f(x) g(x) for some x,y [0, 1], then inf R(f)sup R(g)d)If f(x) g(x)for all x,y, then sup R(f) inf R(g)Correct answer is option 'B,C,D'. Can you explain this answer? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about Let f, g : [0, 1] [0, 1] be functions. Let R(f) and R(g) be the ranges of f and g, respectively.Which of the following statements is (are) true?a)If f(x) g(x) for all x [0, 1], then sup R(f) inf R(g)b)If f(x) g(x)for some x [0, 1], then inf R(f) sup R(g)c)If f(x) g(x) for some x,y [0, 1], then inf R(f)sup R(g)d)If f(x) g(x)for all x,y, then sup R(f) inf R(g)Correct answer is option 'B,C,D'. Can you explain this answer? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Let f, g : [0, 1] [0, 1] be functions. Let R(f) and R(g) be the ranges of f and g, respectively.Which of the following statements is (are) true?a)If f(x) g(x) for all x [0, 1], then sup R(f) inf R(g)b)If f(x) g(x)for some x [0, 1], then inf R(f) sup R(g)c)If f(x) g(x) for some x,y [0, 1], then inf R(f)sup R(g)d)If f(x) g(x)for all x,y, then sup R(f) inf R(g)Correct answer is option 'B,C,D'. Can you explain this answer?.
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