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Class 11MathematicsPermutations and CombinationsPermutationsEasy
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In how many ways can the first two places of a password be filled using (2) letters from (X,Y,Z,W)?

Answer and explanation

Correct answer: (12)

There are (4) choices for the first place and (3) for the second, so (4\times3=12). In passwords, changing positions changes the arrangement.

Related tags

PermutationsClass11EasyPermutations And CombinationsMathematicsClass 11 Mcq
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10 more MCQs
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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 \(\frac{21!}{19!\cdot2!}-\frac{18!}{16!\cdot2!}\)?
  8. 8If \(\frac{(n+1)!}{(n-1)!}-\frac{n!}{(n-2)!}=24\), what is the value of \(n\)?
  9. 9What is the value of \(\frac{22!}{20!\cdot 2!}-\frac{21!}{20!}\)?
  10. 10If (5) different books are arranged in a row, how many ways are possible?
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