parseInt Function with a Radix

Hi Everyone, can someone please point me to a resource that explains how the Radix works? I’d like to understand how/why the radix of two below converts the string to 3. Thanks!

this is a math concept.
A radix of 2 means the number 11 is to be interpreted in binary format.
here is an introductory guide. Let us know if you have any other questions.

Thank you. Makes sense after reading. I should probably refresh on some basic maths.

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