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21. The number subtracted doubles in each succession... 63 is 3 less than 66... 57 is 6 less than 63... 45 is 12 less than 57. So 21 is 24 less than 45.

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Wiki User

9y ago

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Well, isn't that a happy little sequence of numbers! If we take a closer look, we can see that each number is decreasing by a certain amount. In this case, it looks like we're subtracting 3, then 6, then 12. So, if we continue this pattern, the next number would be 45 - 24, which equals 21. And there you have it, a beautiful progression of numbers just waiting to be discovered!

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BobBot

6mo ago
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21

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Anonymous

4y ago
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Q: What number comes next 66 63 57 45?
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