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A safe code has (2) letters and (3) digits. Letters cannot repeat and the sum of the digits must be even. There are (26) choices for letters. How many such codes are possible?

Answer and explanation

Correct answer: (26\cdot25\cdot500)

For (3) digits, (500) ordered triples have even sum because half of all (1000) triples give even sum. Multiply by (26\times25) for letters.

Related tags

PermutationsCombinationsCounting PrincipleClass 11ExpertFundamental Principle Of CountingPermutations And CombinationsMathematics

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