Given val a = true, val b = false, and val c = true, which expression returns true only if exactly two variables are true?

hard📝 Application Q9 of 15

Kotlin - Data Types

Given val a = true, val b = false, and val c = true, which expression returns true only if exactly two variables are true?

A(a && b && !c) || (a && !b && c) || (!a && b && c)

Ba && b && c

Ca || b || c

D(a && b) || (b && c) || (a && c)

Step-by-Step Solution

Solution:

Step 1: Understand the requirement
Return true only if exactly two variables are true.
Step 2: Analyze options
(a && b && !c) || (a && !b && c) || (!a && b && c) checks all combinations where exactly two are true and one is false.
Final Answer:
(a && b && !c) || (a && !b && c) || (!a && b && c) returns true only if exactly two are true -> Option A
Quick Check:
Check all two-true combinations explicitly [OK]

Quick Trick: Combine AND and NOT to check exact true counts [OK]

Common Mistakes:

MISTAKES

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