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Anonymous
600 BC is one year - way back in history. It is like asking how many years is 2012. It is one year - it will start in around 6 months from now (late June 2011) and finish exactly a year later. 2012 is 1 year.
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100 years
A billion years equals a billion years. 1,000,000,000 years
456 months in 38 years.
1 decade equals 10 years.
One thousand