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Subjects
Class 11MathematicsPermutations and CombinationsPermutationsMedium
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How many (4)-digit numbers can be formed from (0,1,2,3,4,5,6,7) without repetition?

Answer and explanation

Correct answer: (1470)

The first digit cannot be (0), so (7\cdot7\cdot6\cdot5=1470). In exams, apply the leading-zero condition first.

Related tags

PermutationsDigitsZero RestrictionPermutations And CombinationsMathematicsClass 11 Mcq
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