Question

A company decide a new identity code for all its employees

Answer 1

Each number is to consist of four different digits from 0 to 9, inclusive, except that the first digit cannot be 0. How many different identification numbers are possible? ... The second digit can also take 9 values (9 digits minus the one we used for the first digit plus 0);

Answer 2

Explanation:

A company decides a new identity code for all its employees the identity code would comprise of five letter initials that can e formed using the albhabets of english language such that the fifth letter is always a consonant how many such combination are ossible.