2： There are 2 mathcounts (mock) problems among us

A quick reminder of what a factorial is:
5!=5*4*3*2*1, 20!=20*19*...*1

Reminder on infinite geometric series

Multiple Choice

What is $$\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}...$$

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