(4) अलग-अलग हिंदी और (4) अलग-अलग अंग्रेजी पुस्तकों को ऐसे कितने तरीकों से रखा जाए कि कोई दो हिंदी पुस्तकें साथ न हों?
In how many ways can (4) distinct Hindi books and (4) distinct English books be arranged so that no two Hindi books are together?
Explanation opens after your attempt
A. (2880)
Concept
Arrange English books first in (4!) ways, then place (4) Hindi books in (5) gaps in \(^{5}P_4\) ways. The total is \(4!\cdot^{5}P_4=2880\).
Why this answer is correct
The correct answer is A. (2880). Arrange English books first in (4!) ways, then place (4) Hindi books in (5) gaps in \(^{5}P_4\) ways. The total is \(4!\cdot^{5}P_4=2880\).
Exam Tip
पहले अंग्रेजी पुस्तकें (4!) तरीकों से रखें, फिर (5) gaps में (4) हिंदी पुस्तकें \(^{5}P_4\) तरीकों से रखें। कुल \(4!\cdot^{5}P_4=2880\) है।
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