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A license code has (3) letters and (3) digits. Repetition is allowed among (7) letters, but not among digits (0) to (9). The sum of the digits must be odd. How many codes are possible?

Answer and explanation

Correct answer: (123480)

The letters have (7^3) choices. For the sum of three distinct digits to be odd, the number of odd digits must be (1) or (3).

Related tags

License-CodeParityDigitsFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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