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Question: How long is the largest prime number?
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Question: A certain radioactive material has a halflife of 160 years. If you have 1 kg of this material now, how many grams will you have after 640 years?
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62.5 GRAMS. Why? after 160 years you have 500 g / after 320 yrs you have 250 g / after 480 yrs you have 125 g / after 640 yrs you have 62.5 g 
Question: You have five books, and want to take three with you on vacation. How many different 3book combinations could you take?
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Question: There are approximately 1.6 million of these in every mile. What are they?
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