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Class 11MathematicsPermutations and CombinationsFundamental principle of countingExpert
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Using letters (A,B,C) and digits (1,2,3,4), how many strings of (5) symbols can be formed if repetition is allowed, the first symbol is a letter, and the last symbol is a digit?

Answer and explanation

Correct answer: (4116)

The first position has (3) choices, the last has (4), and each middle position has (7) choices. Multiply choices for independent positions.

Related tags

StringsRepetitionFundamental-PrincipleFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
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