Number of 7 digit telephone numbers that can be formed from the digits 0 , 1 , 2 , ,………………..9 , if each telephone number begins with digit 5 is

The number of four digited even numbers that can be formed with the digits 0,1,2,5,7,8 is

How many 5-digit telephone numbers can be formed with the digits 0, 1, 2, 3, ….., 8, 9 if each number starts with 67 and no digit appears more than once ?

The number of 4 -digit numbers that can be formed from the digits 0,1,2,3,4,5,6,7 so that each number contains digit 1 is

Number of 6 -digit telephone numbers, whichcan be constructed with digits 0,1,2,3,4,5,6,7,8,9, if each number starts with 35 and nodigit appears more than once is

Find the number of 4 - digit telephone numbers that can be formed using the digits 1,2,3,4,5,6 with atleast one digit repeated.