अंकों (0,2,3,4,7,9) से बिना पुनरावृत्ति (4) अंकों की कितनी विषम संख्याएं बनेंगी?
How many (4)-digit odd numbers can be formed from (0,2,3,4,7,9) without repetition?
Explanation opens after your attempt
B. (150)
Concept
There are (3) odd choices for the units place, then (4) valid choices for the thousands place after excluding (0). The total is \(3\cdot4\cdot4\cdot3=144\).
Why this answer is correct
The correct answer is B. (150). There are (3) odd choices for the units place, then (4) valid choices for the thousands place after excluding (0). The total is \(3\cdot4\cdot4\cdot3=144\).
Exam Tip
इकाई स्थान पर (3) विषम विकल्प हैं, फिर हजार के स्थान पर (0) छोड़कर (4) विकल्प बचते हैं। कुल \(3\cdot4\cdot4\cdot3=144\) होता है।
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