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24 Oct 2021, 10:14
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Finish these sequences...
3, 9, -1, 1, -9, 81, X
3, 2, -2, 16, -7, X
Thanks.
3, 9, -1, 1, -9, 81, X
3, 2, -2, 16, -7, X
Thanks.
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27 Oct 2021, 11:18
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Aurelius187
I'm not sure whether these questions are meant to be a diversion from studying for the actual GMAT, but I I feel that I must mention that the GMAT will NEVER test one's ability to find missing terms in a sequence unless the sequence is defined for us. The reason is that there's no way that we can definitively determine ONE (and ONLY ONE) pattern in a given sequence.
Consider this example: 1, 2, 4, __
What's the missing term here?
Well, if we read the sequence as doubling from one term to the next, the next term is 8
HOWEVER, if we notice that we keep adding successively larger integers to each term (i.e., add 1, then add 2, then add 3, etc.) the next term is 7
Likewise, (if we want to get a bit silly), we might look at the given sequence (5, 28, 57, 78, 125, __) and say that the missing term is 88. Why?
Because 5 is my favorite number, 28 is my 2nd favorite number, 57 is my 3rd favorite number, ... and 88 is 6th favorite number.
So, rest assured, you won't be required to find missing terms on a GMAT sequence, unless the sequence is defined for us.
Cheers,
Brent
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
