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QUESTION
16th Desultory Bank is installing new ATM machines. Each machine features a keypad with 7 keys, each with a unique image or emoji label.
16th Desultory Bank is installing new ATM machines. Each machine features a keypad with 7 keys, each with a unique image or emoji label. They require customers to select a(n) 8 key pin to access their accounts for security. How may unique ATM pins are possible?
(Note that you may repeat key selection. i.e. " ♥ ♥ ♥" is a valid 3-character pin)
