(8) अलग-अलग किताबों में से (5) किताबें चुनकर शेल्फ पर रखने के कितने तरीके हैं?
In how many ways can (5) books be selected from (8) distinct books and arranged on a shelf?
Explanation opens after your attempt
A. (6720)
Concept
Selection is followed by ordering, so \(^{8}P_5=6720\). In exams, placing on a shelf indicates arrangement.
Why this answer is correct
The correct answer is A. (6720). Selection is followed by ordering, so \(^{8}P_5=6720\). In exams, placing on a shelf indicates arrangement.
Exam Tip
चयन के साथ क्रम भी है, इसलिए \(^{8}P_5=6720\)। परीक्षा में shelf पर रखना arrangement बताता है।
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