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Class 11MathematicsPermutations and CombinationsFundamental principle of countingHard
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A three-letter word is formed from (A,B,C,D,E,F). Letters may repeat, but the word must contain exactly two distinct letters. How many words are possible?

Answer and explanation

Correct answer: (90)

Choose (2) letters from (6) and ensure both appear in the three positions. Each pair gives (2^3-2) words.

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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