(9) अलग-अलग अक्षरों से (4) अक्षरों के पासवर्ड कितने बनेंगे यदि कोई अक्षर दोहराया नहीं जाए?
How many (4)-letter passwords can be formed from (9) distinct letters if no letter is repeated?
Explanation opens after your attempt
A. (3024)
Concept
Order matters in a password, so \(^{9}P_4=3024\). In exams, treat passwords or codes as permutations.
Why this answer is correct
The correct answer is A. (3024). Order matters in a password, so \(^{9}P_4=3024\). In exams, treat passwords or codes as permutations.
Exam Tip
पासवर्ड में क्रम महत्वपूर्ण है, इसलिए \(^{9}P_4=3024\)। परीक्षा में password या code को permutation समझें।
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