Just realized how much trouble a single ‘valueless’ 0 can cause.
Silly Typo XD
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Yes, you can call them essentially the same, aside from minor difference @aryanc403 pointed out. People use them interchangeably
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Basic combinatorics. What are the possible values which all the N-2 digits can take (except first digit and last digit)? Anything from 0 to 9. Total choices per digit =10. Number of digits$= N-2$. Hence Ans= 10*10*10....N-2 times. Hence {10}^{N-2}