Question: You need to set a 1 0 - digit PIN. There is a hexadecimal keypad ( 0 - 9 , A - F ) ,

You need to set a 10-digit PIN. There is a hexadecimal keypad (0-9, A-F), but there are some restrictions on the PIN you can choose.
- You can re-use digits but you cannot have repeating digits next to each other, e.g. the PIN cannot contain "00","222","77","BB","CCC", etc.
- You cannot have adjacent digits next to each other, e.g. the PIN cannot contain "34","67","21","9A","DC", etc. (0 and F are considered adjacent for this restriction; think of the 16 digits as being in a circle)
1. How many possible PINs are there?
2. How many bits of entropy does a PIN contain? If rounding is required, answer to 1 decimal point.
3. Why is this an approximation and not a true reflection of the strength of a PIN, despite the restrictions in place?
Show your calculation steps and provide an explanation of how you arrived at the answer.
You need to set a 1 0 - digit PIN. There is a

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