Subscript/Superscript conventions

Hi! I am really enjoying the courses so far. I’m wondering why we sometimes use subscripts and superscripts from 1 to n rather than 0 to n - 1 like is convention for other programming concepts. Just curious. Is this a convention in mathematics vs programming/CS? Thanks!

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The convention for examples is from 1 to m.
The convention for features is from 0 to n-1.

Thanks! But why is the convention for examples different from other conventions?