(9) अलग-अलग झंडों में से (5) झंडों का संकेत बनाना है, पर एक विशेष झंडा जरूर शामिल हो। कितने संकेत बनेंगे?
A signal of (5) flags is to be made from (9) distinct flags, but one particular flag must be included. How many signals are possible?
Explanation opens after your attempt
B. (6720)
Concept
Choose the position of the particular flag in (5) ways and fill the other (4) positions from (8) flags in \(^{8}P_4\) ways. The total is \(5\cdot{}^{8}P_4=8400\).
Why this answer is correct
The correct answer is B. (6720). Choose the position of the particular flag in (5) ways and fill the other (4) positions from (8) flags in \(^{8}P_4\) ways. The total is \(5\cdot{}^{8}P_4=8400\).
Exam Tip
विशेष झंडे का स्थान (5) तरीकों से चुनें और बाकी (4) स्थान (8) झंडों से \(^{8}P_4\) तरीकों से भरें। कुल \(5\cdot{}^{8}P_4=8400\) है।
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