एक (5)-स्थान पासवर्ड में (6) प्रतीक उपलब्ध हैं। पहले दो स्थान समान नहीं हो सकते और अंतिम दो स्थान समान होने चाहिए। पुनरावृत्ति अन्य जगह मान्य है। कुल पासवर्ड कितने हैं?
In a (5)-place password (6) symbols are available. The first two places cannot be the same and the last two places must be the same. Repetition is allowed elsewhere. How many passwords are possible?
Explanation opens after your attempt
A. (1080) पासवर्ड(1080) passwords
Concept
There are (6) choices for the first place (5) for the second (6) for the third and (6) choices for the equal fourth-fifth pair. The total is \(6 \times 5 \times 6 \times 6=1080\).
Why this answer is correct
The correct answer is A. (1080) पासवर्ड / (1080) passwords. There are (6) choices for the first place (5) for the second (6) for the third and (6) choices for the equal fourth-fifth pair. The total is \(6 \times 5 \times 6 \times 6=1080\).
Exam Tip
पहले स्थान के (6) दूसरे के (5) तीसरे के (6) और चौथे-पांचवें समान जोड़े के (6) विकल्प हैं। कुल \(6 \times 5 \times 6 \times 6=1080\) है।
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