(11) अलग-अलग सिक्कों को पंक्ति में कितने तरीकों से रखा जाए यदि एक विशेष सिक्का किसी भी सिरे पर हो?
In how many ways can (11) distinct coins be arranged in a row if one particular coin is at either end?
Explanation opens after your attempt
A. (7257600)
Concept
The particular coin has (2) end choices and the remaining (10) coins are arranged in (10!) ways. The total is \(2\cdot10!=7257600\).
Why this answer is correct
The correct answer is A. (7257600). The particular coin has (2) end choices and the remaining (10) coins are arranged in (10!) ways. The total is \(2\cdot10!=7257600\).
Exam Tip
विशेष सिक्के के लिए (2) सिरों के विकल्प हैं और शेष (10) सिक्के (10!) तरीकों से रखे जाएंगे। कुल \(2\cdot10!=7257600\) है।
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