Question: i) How many four-digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, and 6 if each digit can be used

i) How many four-digit numbers can be formed from the digits 0, 1, 2, 3, 4, 5, and 6 if each digit can be used only once? ii) How many of these are even numbers? iii) How many are greater than 2020

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