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1e9 is a scientific notation that represents the number 1 followed by 9 zeros, which is equivalent to 1,000,000,000 or one billion. The "e" in 1e9 stands for "exponent," indicating that the number should be multiplied by 10 raised to the power of 9. This notation is commonly used in mathematics and science to represent very large numbers in a more concise and manageable form.
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