Subsets & Combinations - Letter Case Permutation
Given the input string
"b2C", what is the output list of all letter case permutations?Given the input string "b2C", what is the output list of all letter case permutations?
easy🧾 Trace Q3 of Q15
Step-by-Step Solution
Solution:
Step 1: Identify letters and digits
Letters: 'b', 'C'; Digit: '2' remains unchanged.Step 2: Generate permutations
Toggle 'b' -> 'b' or 'B'; toggle 'C' -> 'c' or 'C'. Combine with '2' fixed.Final Answer:
Option D -> Option DQuick Check:
2 letters yield 2^2=4 permutations [OK]
Quick Trick: Number of permutations = 2^(number of letters) [OK]
Common Mistakes:
MISTAKES- Changing digits mistakenly
- Missing some case toggles
Trap Explanation:
PITFALL- Ignoring digits or toggling digits leads to wrong outputs.
Interviewer Note:
CONTEXT- Tests ability to trace letter case permutation outputs.
Master "Letter Case Permutation" in Subsets & Combinations
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