The given sequence is:
18, 21, 24, 27, 30, 33, 36, ?
Step-by-step:
Let's look at the difference between each term:
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21 − 18 = 3
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24 − 21 = 3
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27 − 24 = 3
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30 − 27 = 3
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33 − 30 = 3
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36 − 33 = 3
So, this is an arithmetic sequence with a common difference of 3.
Next number:
36 + 3 = 39
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