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09 Dec 2019, 11:12
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
63% (02:27) correct
37%
(02:21)
wrong
based on 406
sessions
History
Date
Time
Result
Not Attempted Yet
What is the sum of the series 12, 2, 15, -1, 18, -4, 21, -7, ..... 30?
A. 74
B. 84
C. 94
D. 104
E. 114
A. 74
B. 84
C. 94
D. 104
E. 114
09 Dec 2019, 11:42
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It's important to note that the GMAT won't test our 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
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
09 Dec 2019, 23:07
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While solving the question similar question was banging in my head. Why would GMAT give such a question where more time is wasted in trying to figure out what is the series instead of sum.?
Though e-gmat gives a solution which i am yet to come across for any Official question.
Though e-gmat gives a solution which i am yet to come across for any Official question.
