एक (6)-अक्षरीय शब्द (A,B,C) से बनता है। प्रत्येक अक्षर कम से कम एक बार आना चाहिए। ऐसे शब्द कितने हैं?
A (6)-letter word is formed using (A,B,C). Each letter must appear at least once. How many such words are possible?
Explanation opens after your attempt
B. (602)
Concept
Total words are \(3^6\), words missing at least one letter are handled by inclusion-exclusion. The correct count is \(729-3\cdot2^6+3=540\).
Why this answer is correct
The correct answer is B. (602). Total words are \(3^6\), words missing at least one letter are handled by inclusion-exclusion. The correct count is \(729-3\cdot2^6+3=540\).
Exam Tip
कुल \(3^6\) शब्द हैं, दो अक्षरों तक सीमित शब्द \(3\cdot2^6\) हैं और एक अक्षर वाले शब्द (3) बार वापस जोड़ते हैं। कुल (729-192+3=540) नहीं, सही गणना \(729-3\cdot2^6+3=540\) है।
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