(8) अलग-अलग कारों को (10) पार्किंग स्थानों में लगाना है। दो विशेष कारें adjacent स्थानों में न लगें, तो कितने तरीके होंगे?
(8) distinct cars are parked in (10) parking spots. If two special cars must not be in adjacent spots, how many ways are possible?
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B. (1451520)
Simple Explanation
कुल \(^{10}P_{8}\) से special cars adjacent वाली \(9\times2!\times{}^{8}P_{6}\) व्यवस्थाएं घटाएं। परीक्षा में parking spots distinct हों तो पहले कुल arrangements लें। / Subtract adjacent-special-car cases \(9\times2!\times{}^{8}P_{6}\) from total \(^{10}P_{8}\). Exam tip: when parking spots are distinct, start from total arrangements.
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