(7) अलग-अलग पेन में से (4) पेन को क्रम से रखने के तरीके कितने हैं?

How many ways are there to arrange (4) pens selected from (7) different pens in order?

Explanation opens after your attempt
Correct Answer

A. (840)

Step 1

Concept

\({}^{7}P_{4}=7\times6\times5\times4=840\). For (r) places, multiply (r) decreasing factors.

Step 2

Why this answer is correct

The correct answer is A. (840). \({}^{7}P_{4}=7\times6\times5\times4=840\). For (r) places, multiply (r) decreasing factors.

Step 3

Exam Tip

\({}^{7}P_{4}=7\times6\times5\times4=840\)। (r) स्थानों के लिए (r) घटते गुणनखंड लें।

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Mathematics Answer, Explanation and Revision Hints

(7) अलग-अलग पेन में से (4) पेन को क्रम से रखने के तरीके कितने हैं? / How many ways are there to arrange (4) pens selected from (7) different pens in order?

Correct Answer: A. (840). Explanation: \({}^{7}P_{4}=7\times6\times5\times4=840\)। (r) स्थानों के लिए (r) घटते गुणनखंड लें। / \({}^{7}P_{4}=7\times6\times5\times4=840\). For (r) places, multiply (r) decreasing factors.

Which concept should I revise for this Mathematics MCQ?

\({}^{7}P_{4}=7\times6\times5\times4=840\). For (r) places, multiply (r) decreasing factors.

What exam hint can help solve this Mathematics question?

\({}^{7}P_{4}=7\times6\times5\times4=840\)। (r) स्थानों के लिए (r) घटते गुणनखंड लें।