अंकों (0,2,4,6,8) से बिना पुनरावृत्ति कितनी (2)-अंकीय सम संख्याएँ बन सकती हैं?
How many (2)-digit even numbers can be formed from digits (0,2,4,6,8) without repetition?
Explanation opens after your attempt
B. (16)
Concept
If the unit digit is (0), there are (4) ways, and if it is a non-zero even digit, there are \(4\times3=12\) ways, total (16). Make cases for zero questions.
Why this answer is correct
The correct answer is B. (16). If the unit digit is (0), there are (4) ways, and if it is a non-zero even digit, there are \(4\times3=12\) ways, total (16). Make cases for zero questions.
Exam Tip
इकाई पर (0) हो तो (4) तरीके और इकाई पर गैर-शून्य सम अंक हो तो \(4\times3=12\) तरीके हैं, कुल (16)। शून्य वाले प्रश्न में cases बनाएं।
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