(9) वस्तुओं में से (2) वस्तुओं को क्रम में रखने के तरीके कितने हैं?
How many ways are there to arrange (2) objects selected from (9) objects in order?
Explanation opens after your attempt
C. (72)
Concept
The answer is \({}^{9}P_{2}=9\times8=72\). After the first place, the second choice decreases by one.
Why this answer is correct
The correct answer is C. (72). The answer is \({}^{9}P_{2}=9\times8=72\). After the first place, the second choice decreases by one.
Exam Tip
उत्तर \({}^{9}P_{2}=9\times8=72\) है। पहले स्थान के बाद दूसरा विकल्प एक कम हो जाता है।
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