अंकों (1,2,4,5) से बिना पुनरावृत्ति कितनी (2)-अंकीय संख्याएँ बनेंगी?
How many (2)-digit numbers can be formed from digits (1,2,4,5) without repetition?
Explanation opens after your attempt
D. (12)
Concept
There are (4) choices for tens and (3) for units, so \(4\times3=12\). Changing places changes the number.
Why this answer is correct
The correct answer is D. (12). There are (4) choices for tens and (3) for units, so \(4\times3=12\). Changing places changes the number.
Exam Tip
दहाई के लिए (4) और इकाई के लिए (3) विकल्प हैं इसलिए \(4\times3=12\)। स्थान बदलने से संख्या बदलती है।
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