21.24.24.24.27.24.30.24 () () what number should be filled in the brackets?

33,24
All divided by 3 is 7.8.8.8.9.8.10.8
You can add another 8 to the front, and you'll see
8.7.8.8.8.8...8.9.8...8.10.8...8.11.8
So the last two are 11 * 3 = 33 and 8 * 3 = 24

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