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OpenStudy (anonymous):
What is the missing number in this sequence? 19 , 9 , -1 , ___ , -21
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OpenStudy (anonymous):
It seems like there's a pattern... could you spot it? :) Here's a hint... you seem to be taking away a certain number, at every step...
OpenStudy (johnweldon1993):
to get from 19 to 9...you do what? to get from 9 to -1...you do what again? (same thing as before) after you see that pattern...apply it to -1
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