How many 5-digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

How many 5 digits telephone numbers can be constructed using the digits 0 to 9 if each number starts with 67 and no digit appears more than once?

How many 6-digit telephone numbers can be constructed using the digits 0 to 9, if each number starts with 67 and no digit appears more than once?

How many 5-digit telephone numbers can be constucted using the digits 0 to 9 if each numbers starts with 67 and no digit appears more than once?

How many 8- digit telephone numbers can be constructed using the digits 0 to 9 if each number starts with 270 and no digit appears more than once?

How many five digits telephone numbers can be constructed using the digits 0 to 9, if each number starts with 67 and no digit appears more than once?

the 5-digits telephone numbers can be constructed using the digits 0 to 9, if each number starts with 67 and no digit appears more than once are:

How many five digit telephone numbers can be constructed using the digits 0 to 9. If each numbers starts with 67 and no digit a appears more than once?

How many five digit telephone numbers can be constructed using the digits 0 to 9. If each numbers starts with 67 and no digit a appears more than once?

How many 5 digit telephone numbers can be constructed using the digits 0 to 9, if starts with 67 and no digit appears more than once ?