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If a progression goes 15 __ 21, then the missing number will dictate how the pattern increases with every number. If the missing number is 18, this means that the numbers go up in threes. The pattern would continue 24, 27, 30, 33...

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14y ago
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Q: If the first number is 15 and then their was a space and then 21 what is the missing number?
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