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Question: imagine you have a dollar bill if you double it...

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Imagine you have a dollar bill. If you double it, you have two bills. If you double again, you have four bills. If you double again, you have eight bills,and so on. Given that a bill is 0.1 mm thick, how many doublings do you have to go through before you have a stack that reaches from the Earth to the moon? (The moon is 360,000 km away.)

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