यदि \(^{n}P_r=^{n}P_{r-1}\times12\) हो, तो (12) किस expression के बराबर होगा?
If \(^{n}P_r=^{n}P_{r-1}\times12\), then (12) is equal to which expression?
Explanation opens after your attempt
C. (n-r+1)
Concept
In the permutation recurrence, the new factor is the choices for the (r)th position, (n-r+1). In exams connect the multiplier with the next position.
Why this answer is correct
The correct answer is C. (n-r+1). In the permutation recurrence, the new factor is the choices for the (r)th position, (n-r+1). In exams connect the multiplier with the next position.
Exam Tip
क्रमचय recurrence में नया गुणक (r)वें स्थान के विकल्प (n-r+1) होता है। परीक्षा में multiplier को next position से जोड़ें।
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