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Which expression correctly checks if variable x is NOT between 5 and 15 (exclusive)?

hard📝 Application Q9 of 15
Python - Operators and Expression Evaluation
Which expression correctly checks if variable x is NOT between 5 and 15 (exclusive)?
Ax <= 5 or x >= 15
Bx >= 5 and x <= 15
Cx > 5 and x < 15
Dx < 5 or x > 15
Step-by-Step Solution
Solution:

  1. Step 1: Understand 'not between 5 and 15 exclusive'

    'Between 5 and 15 exclusive' means 5 < x < 15. NOT that is x <= 5 or x >= 15.

  2. Step 2: Choose correct comparison operators

    Use 'x < 5 or x > 15' to check outside the exclusive range.

  3. Final Answer:

    x < 5 or x > 15 -> Option D

  4. Quick Check:

    NOT exclusive between uses '<' and '>' with OR [OK]
Quick Trick: Use OR with '<' and '>' for outside exclusive range [OK]
Common Mistakes:
MISTAKES
  • Using '<=' and '>=' which checks NOT inclusive between
  • Using AND instead of OR
  • Confusing inside vs outside range

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