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A vehicle number consists of two letters followed by two digits. There are 4 choices for each letter and 10 choices for each digit. If repetition of letters and digits is allowed, how many distinct vehicle numbers can be formed?

Answer and explanation

Correct answer: 1600

By the multiplication principle, the choices for all four positions are multiplied. Thus, the total number of vehicle numbers is \\(4\times4\times10\times10=1600\\). Since repetition is allowed, each letter and digit position retains its full set of choices. The answer 400 does not correctly multiply the choices for all four positions. Exam tip: multiply the number of choices available at each successive independent position.

Related tags

Permutations And CombinationsMultiplication PrincipleFundamental Counting PrincipleRepetition AllowedVehicle NumberCombinationsMathematicsClass 11 Mcq

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