How many 4-digit numbers can be formed by numbers 1,2,3,4,5,6,7 if no digit is repeated?

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How many 4-digit numbers can be formed by numbers 1,2,3,4,5,6,7 if no digit is repeated?

Ravindra Pindel 15th Sep, 2021

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Ravindra Pindel 15th Sep, 2021

The number of 4-digit numbers can be formed by numbers 1,2,3,4,5,6,7 if no digit is repeated = 7 x 6 x 5 x 4 = 840

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