एक पुस्तक शेल्फ पर (5) अलग गणित और (4) अलग भौतिकी पुस्तकें रखनी हैं। पहली और अंतिम पुस्तक अलग-अलग विषयों की होनी चाहिए। कुल व्यवस्थाएँ कितनी होंगी?
On a shelf, (5) distinct mathematics books and (4) distinct physics books are to be arranged. The first and last books must be from different subjects. How many arrangements are possible?
Explanation opens after your attempt
Correct Answer
B. (460800)
Concept
There are two subject patterns for the first and last positions. The count is (\(5 \times 4+4 \times 5\) \times 7!).
Why this answer is correct
The correct answer is B. (460800). There are two subject patterns for the first and last positions. The count is (\(5 \times 4+4 \times 5\) \times 7!).
Exam Tip
पहली-आखिरी विषय व्यवस्था दो प्रकार की है। गिनती (\(5 \times 4+4 \times 5\) \times 7!) होगी।
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