4,500,000,000
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a billion numbers
1 billion in numbers is 1000000000 in the short scale, such as used in the US, and 1000000000000 in the long scale, such as used in the UK.
i think it is 67,000,000,000
Because of the uniqueness of numbers, 1 billion is equal to exactly 1 billion: not more nor less.
write 4.5 in fractional form