b. As an IT executive, one of the task is to manage the issues of information security. For this reason, the executive need to identify how many username and password that can be generated. Several questions have been asked before any report can be presented. Help this IT executive by solving the question below. i. How many possible 6 alphanumeric usernames (which 3 uppercase followed by 3 digit), if uppercase and digit letter can be repeated. ii. By given allowed uppercase is A, B, C, D, E, F, and G, how many possible 6 alphabet password if uppercase letter only can be repeated? iii. By given allowed uppercase is A, B, C, D, E, F, and G, how many possible 6 alphabet password if uppercase letter can only be used once?

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