Lots of people are just dividing by two, but it is an exponent problem.
In round 1 I call two people, so Round 1 = 2
In round 2 those 2 people each call 2 people, so Round 2 = 4
In round 3 those 4 people each call 2 people, so Round 3 = 8
and so on. We need to get to about 307,000,000, how many rounds will it take?
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