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27-04-2018
Mathematics

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How many four digit numbers can be formed from the digits 123456 if no digit may be repeated in a number?

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mathmate mathmate

28-04-2018

First digit: 6 choices
second digit: 5 choices
third digit: 4 choices
fourth digit: 3 choices

Total number of arrangements
= 6*5*4*3
=360

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