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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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A (4)-letter code is formed from (X,Y,Z,W). No two consecutive letters can be same, and the first and last letters must be same. How many codes can be formed?

Answer and explanation

Correct answer: (36)

There are (4) choices for the first and last letter. The second and third positions have (3) and (3) choices respectively, so the total is (36).

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics
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