(6) अलग-अलग अंकों से बिना पुनरावृत्ति (2) अंकों के कितने क्रमित कोड बनेंगे यदि पहला अंक (0) नहीं हो सकता?
How many ordered (2)-digit codes can be formed from (6) distinct digits without repetition if the first digit cannot be (0)?
Explanation opens after your attempt
B. (25)
Concept
There are (5) choices for the first place and (5) choices for the second. Hence (25) codes are formed.
Why this answer is correct
The correct answer is B. (25). There are (5) choices for the first place and (5) choices for the second. Hence (25) codes are formed.
Exam Tip
पहले स्थान के लिए (5) विकल्प और दूसरे के लिए (5) विकल्प हैं। इसलिए कुल (25) कोड बनेंगे।
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