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In a row of (9) people, how many arrangements have (A) before (B) but (A) and (B) not adjacent?(9) व्यक्तियों की पंक्ति में (A), (B) से पहले आए लेकिन (A) और (B) साथ न बैठें, ऐसी कितनी व्यवस्थाएं हैं?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (141120)(141120)
Arrangements with (A) before (B) are (9!/2), and adjacent cases with (A) before (B) are (8!). Handle order and adjacency separately.(A) पहले (B) से आने वाली व्यवस्थाएं (9!/2) हैं और साथ में (A) पहले (B) हो तो (8!) घटेगा। क्रम और साथ की शर्त अलग-अलग संभालें।
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