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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsMedium
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How many (4)-letter passwords can be formed from (9) distinct letters if no letter is repeated?

Answer and explanation

Correct answer: (3024)

Order matters in a password, so (^{9}P_4=3024). In exams, treat passwords or codes as permutations.

Related tags

PermutationsPasswordNprPermutations And CombinationsMathematicsClass 11 Mcq
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  5. 5Three distinct prizes are to be awarded to seven students. No student can receive more than one prize. How many ways are possible?
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  7. 7What is the value of \(\frac{21!}{19!\cdot2!}-\frac{18!}{16!\cdot2!}\)?
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  9. 9What is the value of \(\frac{22!}{20!\cdot 2!}-\frac{21!}{20!}\)?
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