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A code has 3 letter positions followed by 2 symbol positions. Each letter position has 5 choices, and repetition of letters is allowed. There are 4 symbols available, and symbols cannot repeat. How many codes are possible?

Answer and explanation

Correct answer: 1500 codes

The 3 letter positions can be filled in 5³ ways because repetition is allowed. The 2 symbol positions can be filled in 4 × 3 ways because symbols cannot repeat. Thus, the total is 5³ × 4 × 3 = 1500 codes.

Related tags

Counting PrincipleRepetition RestrictionsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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