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D
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The first term in a sequence S is 108. Is the 19th term in S equals 0?
(1) Every term in S is 6 less than its preceding term.
(2) The tenth term in the S is 33.
Official correct answer provided is (D) - each statement alone is sufficient.
But the second statement doesn't mention whether it's a arithmetic progression, then how can we assume and arrive at the answer. Or is this the norm in sequence based questions
(1) Every term in S is 6 less than its preceding term.
(2) The tenth term in the S is 33.
Official correct answer provided is (D) - each statement alone is sufficient.
But the second statement doesn't mention whether it's a arithmetic progression, then how can we assume and arrive at the answer. Or is this the norm in sequence based questions
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
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Thank you for understanding, and happy exploring!
Updated on: 24 Jul 2026, 18:23
Originally posted by MarkGMATMentor on 24 Jul 2026, 17:45.
Last edited by MarkGMATMentor on 24 Jul 2026, 18:23, edited 1 time in total.
Last edited by MarkGMATMentor on 24 Jul 2026, 18:23, edited 1 time in total.
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kalaivana
Hi kalaivana,
I think this question is poorly constructed and you can safely ignore it.
Statement 1 gives us the rule for the sequence. Since we also know the first term, from this we can calculate what the 19th term is. Sufficient.
Statement 2 gives us another term in the sequence, but no way to calculate any other terms. You're correct that we can't assume it's an arithmetic progression. Insufficient.
The answer should be A, only Statement 1 is sufficient.
However, this is a flawed question because the statements contradict each other. According to Statement 1, every term in S is an even integer. But Statement 2 says that one of the terms is an odd number. Whether or not the answer is C, in a properly constructed DS question, the statements can't contradict each other. (You said that the official answer is C, but I think you meant to say D: each statement alone is sufficient.)
You should throw this question out and not worry about it, and be skeptical of other questions from the same source.
Hope that helps!
~Mark
24 Jul 2026, 18:02
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kalaivana
We cannot assume tis is an arithmetic sequence, ence stmt 2 alone wont work.
I too think answer is A
