(7) distinct books को shelf पर रखना है और (3) special books साथ रहें। Count कौन-सी है?
(7) distinct books are arranged on a shelf and (3) special books stay together. Which count is correct?
Explanation opens after your attempt
A. \(5!\cdot3!\)
Concept
Treating the (3) special books as one block gives (5) objects to arrange. In exams also count (3!) arrangements inside the block.
Why this answer is correct
The correct answer is A. \(5!\cdot3!\). Treating the (3) special books as one block gives (5) objects to arrange. In exams also count (3!) arrangements inside the block.
Exam Tip
(3) special books को one block मानने पर (5) objects arrange होते हैं। परीक्षा में block के अंदर (3!) arrangements भी गिनें।
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