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Using digits (1,2,3,4,5,6,7) without repetition, how many four-digit numbers have the thousands digit greater than the units digit?

Answer and explanation

Correct answer: (420)

Total arrangements are (7 \times 6 \times 5 \times 4). For the thousands and units positions, exactly half have the thousands digit larger.

Related tags

PermutationsCombinationsCountingHardFundamental Principle Of CountingPermutations And CombinationsMathematicsClass 11 Mcq

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