Total BTC that will be circulated ever

How and why was this total decided… Have i forgitten or did i not cover it

Hi there! I am new to crypto and to the academy so I googled “why did satoshi choose 21 million?”
It is fascinating! Apparently he stated in emails “why” and the math is shown about “how”
he did it. It seems some people believe he created BTC first and the math determined the amount. I think he decided the amount first then set up the math to work out that way.

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Hi I’m new too…I’m gonna have to google it :joy: but thanks …what is the maths I wonder