Mathematics, 19.10.2020 23:01, masonbitterman2604

Part A: A keypad lock asks you to input a four-digit code. If you can choose any digit, 0 through 9, for each of the four digits, how many possible combinations are there? Part B: Suppose the similar keypad lock asks for a four-digit code but does not allow you to repeat a digit. How many possible combinations are there for this lock?

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Part A: A keypad lock asks you to input a four-digit code. If you can choose any digit, 0 through 9,...