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In a (3)-letter code each place has (6) letter choices and repetition is allowed. How many codes can be formed?

Answer and explanation

Correct answer: 216

Since repetition is allowed, each of the three positions has 6 choices. By the fundamental principle of counting, the total number of codes is \(6\times6\times6=6^3=216\). The value 36 equals \(6^2\), which would apply to only two positions. Exam tip: multiply the choices for independent positions.

Related tags

Fundamental Principle Of CountingPermutations And CombinationsCode FormationRepetition AllowedClass 11MathematicsClass 11 Mcq

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