How many 6-digit passwords can be formed if the password cannot start with 0 and there are no repeat digits? - Quora
If a 6 digit number abcdef , when multiplied with 6 gives the resulting number as defabc , then the value of a + b + c + d + e + f is
![The number of six - digit numbers that can be formed from the digits 1, 2, 3, 4, 5, 6 and 7 so that digits do not repeat and the terminal digits are even is The number of six - digit numbers that can be formed from the digits 1, 2, 3, 4, 5, 6 and 7 so that digits do not repeat and the terminal digits are even is](https://i.ytimg.com/vi/aqR0hxRpbsc/maxresdefault.jpg)