Question: here is the question: (a) Usually a smartphone has a pin of four to eight digits. How many different pins exist considering that their length

here is the question:

(a) Usually a smartphone has a pin of four to eight digits. How many different pins exist considering that their length varies between four and eight? (b) Imagine a (really unsecure) smartphone, that can be unlocked by entering the right digits, independent from their order. How many different pins do exist then

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