You want to check if a variable x is NOT between 10 and 20 inclusive in Ruby. Which condition correctly uses logical operators?

hard📝 Application Q15 of 15

Ruby - Operators and Expressions

You want to check if a variable x is NOT between 10 and 20 inclusive in Ruby. Which condition correctly uses logical operators?

A!(x >= 10 && x <= 20)

Bx < 10 || x > 20

Cx <= 10 && x >= 20

D!(x < 10 || x > 20)

Step-by-Step Solution

Solution:

Step 1: Understand the range condition
Being between 10 and 20 inclusive means x >= 10 && x <= 20.
Step 2: Find the NOT of the range
The NOT of being between 10 and 20 is being less than 10 OR greater than 20, so x < 10 || x > 20.
Step 3: Check options
!(x >= 10 && x <= 20) negates the range but is correct logically; x < 10 || x > 20 directly expresses the NOT condition without negation. x <= 10 && x >= 20 is impossible (x can't be both <=10 and >=20). !(x < 10 || x > 20) negates the NOT condition, so it's the original range.
Final Answer:
x < 10 || x > 20 -> Option B
Quick Check:
NOT between 10 and 20 = A [OK]

Quick Trick: NOT between means less than OR greater than [OK]

Common Mistakes:

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