Are there an infinite and finite amount of numbers between 0 and 1?

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I saw an exchange on twitter recently, and am wondering if someone can clear this up. Are there an infinite and finite amount of numbers between 0 and 1? I thought there is an infinite amount between two numbers. I'm confused with what the person below means by Infinite, and yet finite. Since the number 1 exists

person a:

   1 + 1 = 2 true?

person b:

   1 + 1 does not equal 2, for some large values of 1

person a:

   there are a lot of decimals points/numbers between 0 and 1

person b:

   not just a lot. Infinite

person a:

   Infinite, and yet finite. Since the number 1 exists
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There are infinite numbers between 0 and 1.

$0.1, 0.01, 0.001, 0.0001, ....$

Just between 0 and .1 there is infinite numbers.