\(^{9}P_4\) की व्युत्पत्ति में गुणनखंडों की सही श्रेणी कौन-सी है?
Which is the correct chain of factors in the derivation of \(^{9}P_4\)?
Explanation opens after your attempt
A. \(9\times8\times7\times6\)
Concept
For four ordered positions the choices are (9), (8), (7), (6). In exams each next choice decreases by one without repetition.
Why this answer is correct
The correct answer is A. \(9\times8\times7\times6\). For four ordered positions the choices are (9), (8), (7), (6). In exams each next choice decreases by one without repetition.
Exam Tip
चार क्रमबद्ध स्थानों के लिए विकल्प (9), (8), (7), (6) हैं। परीक्षा में बिना पुनरावृत्ति हर अगला विकल्प एक कम होता है।
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