शब्द (ARRANGE) के अक्षरों की कितनी व्यवस्थाएं होंगी जिनमें दोनों (R) साथ न आएं?
How many arrangements of the letters of (ARRANGE) are possible in which the two (R)'s are not together?
Explanation opens after your attempt
A. (900)
Concept
First arrange the non-(R) letters in \(\frac{5!}{2!}=60\) ways and place two (R)'s in \(\binom{6}{2}\) gaps. The total is \(60\cdot15=900\).
Why this answer is correct
The correct answer is A. (900). First arrange the non-(R) letters in \(\frac{5!}{2!}=60\) ways and place two (R)'s in \(\binom{6}{2}\) gaps. The total is \(60\cdot15=900\).
Exam Tip
पहले बिना (R) के अक्षरों की \(\frac{5!}{2!}=60\) व्यवस्थाएं बनती हैं और (6) gaps में दो (R) \(\binom{6}{2}\) तरीकों से रखे जाते हैं। कुल \(60\cdot15=900\) है।
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