(6) अलग letters से (4)-letter codes बनते हैं और repetition नहीं है। Formula connection कौन-सा सही है?

(4)-letter codes are formed from (6) distinct letters without repetition. Which formula connection is correct?

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Correct Answer

B. \(^{6}P_4=^{6}C_4\cdot4!\)

Step 1

Concept

Changing order changes the code. In exams usually use permutation relation for codes or passwords.

Step 2

Why this answer is correct

The correct answer is B. \(^{6}P_4=^{6}C_4\cdot4!\). Changing order changes the code. In exams usually use permutation relation for codes or passwords.

Step 3

Exam Tip

Code में order बदलने से code बदल जाता है। परीक्षा में code या password में सामान्यतः permutation relation लगाएं।

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Mathematics Answer, Explanation and Revision Hints

(6) अलग letters से (4)-letter codes बनते हैं और repetition नहीं है। Formula connection कौन-सा सही है? / (4)-letter codes are formed from (6) distinct letters without repetition. Which formula connection is correct?

Correct Answer: B. \(^{6}P_4=^{6}C_4\cdot4!\). Explanation: Code में order बदलने से code बदल जाता है। परीक्षा में code या password में सामान्यतः permutation relation लगाएं। / Changing order changes the code. In exams usually use permutation relation for codes or passwords.

Which concept should I revise for this Mathematics MCQ?

Changing order changes the code. In exams usually use permutation relation for codes or passwords.

What exam hint can help solve this Mathematics question?

Code में order बदलने से code बदल जाता है। परीक्षा में code या password में सामान्यतः permutation relation लगाएं।