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400 of them because a decade is 10 years and 400*10 = 4,000 years which is 4 millennial

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Wiki User

7y ago

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4,000

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Anonymous

4y ago
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4000 duh 🙄

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Anonymous

4y ago
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4000

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Anonymous

4y ago
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Q: How many decades are in 4 millennia?
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