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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsHard
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How many (4)-digit numbers between (4000) and (8000) can be formed from (1,2,3,4,5,6,7,8,9) without repetition?

Answer and explanation

Correct answer: (1680)

The thousands place has (4) choices from (4,5,6,7), and the remaining places have (8\cdot7\cdot6) ways. The total is (1344).

Related tags

PermutationsDigitsRange RestrictionPermutations And CombinationsMathematicsClass 11 Mcq
सुधार सुझाएँ / Earn

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