(n) distinct objects की arrangements में exactly (r) selected positions filled हों और बाकी empty हों, तो कौन-सा formula naturally आता है?
If exactly (r) selected positions are filled by (n) distinct objects and the rest are empty, which formula naturally appears?
Correct answer and explanation
B. \(^{n}P_r\)
Simple Explanation
Positions ordered होते हैं और objects repeat नहीं होते, इसलिए falling choices मिलती हैं। परीक्षा में positions distinct हों तो permutation सोचें। / Positions are ordered and objects are not repeated, so falling choices arise. In exams think of permutations when positions are distinct.
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