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(6) distinct books are to be arranged on a shelf so that (2) particular books always remain together but their internal order may change. What is the number of arrangements?(6) अलग-अलग पुस्तकों को एक शेल्फ पर इस प्रकार सजाना है कि (2) निश्चित पुस्तकें साथ-साथ रहें लेकिन उनका आपसी क्रम बदला जा सके। कुल व्यवस्थाओं की संख्या क्या होगी?
Answer and explanationउत्तर और व्याख्या
Correct answer:सही उत्तर: (240)(240)
Treat the two books as one block giving (5!\times2!) arrangements. In exams, make a block for objects that must stay together.दो पुस्तकों को एक ब्लॉक मानकर (5!\times2!) व्यवस्थाएँ मिलती हैं। परीक्षा में साथ रहने वाली वस्तुओं को ब्लॉक बनाएं।
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