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17 Jan 2020, 02:35
Kudos
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
60% (01:40) correct
40%
(02:46)
wrong
based on 15
sessions
History
Date
Time
Result
Not Attempted Yet
What is the value of d?
(1) \(n^2+an+b=(n+c)(n+d)\)
(2) \(a-c=10\)
Are You Up For the Challenge: 700 Level Questions
(1) \(n^2+an+b=(n+c)(n+d)\)
(2) \(a-c=10\)
Are You Up For the Challenge: 700 Level Questions
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17 Jan 2020, 07:11
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Bunuel
If n = 0, then using both statements, all we know is that b = cd and a = 10 + c, and d can be anything. So the answer is E.
I feel like that's not the intention behind the question; if instead we knew Statement 1 was true for every value of n, then by expanding the right side, we'd learn that c + d = a (since the coefficients in front of the 'n' terms would need to be equal on both sides), and since c + 10 = a from Statement 2, we'd know using both Statements that d = 10. But as the question is written, the answer is E.
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 Data Sufficiency (DS) 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!
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