अंकों (1,2,3,4,5,6,7) से बिना पुनरावृत्ति (3)-अंकीय सम संख्याएं कितनी बनेंगी?
Using the digits (1,2,3,4,5,6,7) without repetition how many (3)-digit even numbers can be formed?
Explanation opens after your attempt
A. (90) संख्याएं(90) numbers
Concept
There are (3) choices (2,4,6) for the unit place then (6) and (5) choices remain. The total is \(3 \times 6 \times 5=90\).
Why this answer is correct
The correct answer is A. (90) संख्याएं / (90) numbers. There are (3) choices (2,4,6) for the unit place then (6) and (5) choices remain. The total is \(3 \times 6 \times 5=90\).
Exam Tip
इकाई स्थान पर (2,4,6) के (3) विकल्प हैं फिर (6) और (5) विकल्प बचते हैं। कुल \(3 \times 6 \times 5=90\) है।
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