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Trillion is a contraction of tri-million. The "tri-" prefix implies 3; how that is used as a power depends where you are:

  • On the long scale, based on powers of a million, as used in Europe:
1 trillion = (1 million)³ = (10⁶)³ = 10¹⁸ = 1,000,000,000,000,000,000
  • On the short scale, based on powers of a thousand plus one, as used in USA:
1 trillion = (1 thousand)³⁺¹ = (10³)⁴ = 10¹² = 1,000,000,000,000
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8y ago

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