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It all depends on how you define one billion. In the USA, a billion is obtained by multiplying a million by 1000. In Europe, a billion is obtained by multiplying a million by another million. So, in the USA the system is as follows: 1000 = one thousand. 1000 x 1000 = 1,000,000 = one million. it might not be the biological answer but it is proved as an answer for the history of answers,

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