Question: How many different 5-digit octal numbers are there which do not contain the digit 0? How many different 5-digit octal numbers are there which do

How many different 5-digit octal numbers are there which do not

How many different 5-digit octal numbers are there which do not contain the digit 0? How many different 5-digit octal numbers are there which do not contain the digit 0 and in which all digits are different? How many 5-digit octal numbers are there which do not contain the digit 0 and where the third digit is an odd number and the last digit and even number

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