(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
Correct Answer

C. (72)

Step 1

Concept

The answer is \({}^{9}P_{2}=9\times8=72\). After the first place, the second choice decreases by one.

Step 2

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.

Step 3

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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Mathematics Answer, Explanation and Revision Hints

(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?

Correct Answer: C. (72). Explanation: उत्तर \({}^{9}P_{2}=9\times8=72\) है। पहले स्थान के बाद दूसरा विकल्प एक कम हो जाता है। / The answer is \({}^{9}P_{2}=9\times8=72\). After the first place, the second choice decreases by one.

Which concept should I revise for this Mathematics MCQ?

The answer is \({}^{9}P_{2}=9\times8=72\). After the first place, the second choice decreases by one.

What exam hint can help solve this Mathematics question?

उत्तर \({}^{9}P_{2}=9\times8=72\) है। पहले स्थान के बाद दूसरा विकल्प एक कम हो जाता है।