(9) अलग-अलग रंगों में से (4) रंगों की ऊपरी-से-निचली पट्टियां बनानी हैं। कितने तरीके हैं?
In how many ways can (4) stripes be made from (9) distinct colours in top-to-bottom order?
Explanation opens after your attempt
A. (3024)
Concept
Changing the top-to-bottom order changes the design, so \(^{9}P_4=3024\). In exams, use permutation for ordered layers.
Why this answer is correct
The correct answer is A. (3024). Changing the top-to-bottom order changes the design, so \(^{9}P_4=3024\). In exams, use permutation for ordered layers.
Exam Tip
ऊपर से नीचे क्रम बदलने पर design बदलता है, इसलिए \(^{9}P_4=3024\)। परीक्षा में ordered layers में permutation लगाएं।
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