Cannot Be Formed - Odd One Out
Cannot Be Formed problems present a source word and several candidate words. You must identify which candidate word CANNOT be formed using letters from the source word (each letter used at most as many times as it appears).
What You'll Learn
Introduction to Cannot Be Formed - Odd One Out
Cannot Be Formed problems present a source word and several candidate words. You must identify which candidate word CANNOT be formed using letters from the source word (each letter used at most as many times as it appears).
Prerequisites
How to Solve Cannot Be Formed - Odd One Out Problems
Step 1: Write the source word and count letter frequencies
Step 2: For each candidate word, count its letter frequencies
Step 3: Check if every letter in candidate is available in source
Step 4: Check if candidate uses any letter more times than source has
Step 5: Eliminate candidates that fail
Step 6: The candidate that fails is the answer
Step 7: If multiple fail, select the one specified
Example Problem
Example: Which word cannot be formed from 'CONSIDER'? Options: COIN, RIDE, SCORE, DONE Solution: Step 1: CONSIDER letters: C(1), O(1), N(1), S(1), I(1), D(1), E(1), R(1) Step 2: COIN needs C,O,I,N → all available ✓ Step 3: RIDE needs R,I,D,E → all available ✓ Step 4: SCORE needs S,C,O,R,E → all available ✓ Step 5: DONE needs D,O,N,E → all available ✓ Step 6: All can be formed? Wait, SCORE uses S,C,O,R,E - all present. So all can be formed. Let me find one that fails: Try 'SCORE' is fine. Actually a common trap is words with duplicate letters. None of these have duplicates. So maybe the example should have a word like 'CREED' (needs two E's, only one). With given options, all can be formed. So the answer might be 'SCORE' if something is missing. Let me check: CONSIDER has no duplicate letters. Any word with a duplicate letter cannot be formed. None of COIN, RIDE, SCORE, DONE have duplicates. So all can be formed. The question might be from a different source word. Let me use a better example: From 'BEAUTIFUL', which cannot be formed? Options: FAULT, TABLE, BEAUTY, TUBE. BEAUTY needs Y - BEAUTIFUL has no Y → cannot be formed. Answer: BEAUTY
Pro Tips & Tricks
- First check for letters not in the source word
- Then check for frequency violations (candidate needs two of a letter source has only one)
- Common source words: CONSIDER, BEAUTIFUL, EDUCATION, GENERATION, IMPORTANT
- Common traps: words with double letters (SUCCESS, COMMITTEE, BEAUTY needs Y)
- If source has no Y, any word with Y fails
- If source has only one T, any word with two T's fails
Shortcut Methods to Solve Faster
Common Mistakes to Avoid
Practice Worksheets
Practice makes perfect! Work through these worksheets to master Cannot Be Formed - Odd One Out. Each worksheet contains 20 questions with detailed explanations. Start from Worksheet 1 and progress through increasing difficulty levels.
Exam Importance
Cannot Be Formed - Odd One Out is an important topic for various competitive exams. Here's how frequently it appears:
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