(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?
Explanation opens after your attempt
B. \(^{6}P_4=^{6}C_4\cdot4!\)
Concept
Changing order changes the code. In exams usually use permutation relation for codes or passwords.
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.
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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