Question

How many numbers of 5 digits can be formed using all digits if each digit
occurs once?
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Answer 1

Answer:

It could be as many as possible

Answer 2

Answer:

The total number of 5 digit numbers that can be formed from 1,2,3 digits are 3*3*3*3*3=243. To get the result where all the digits occur atleast once ,we need to subtract the result of the cases where we dont find all the digits from the total no.