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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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31 Oct 2013, 01:42
this is wron question which can not be from og. pls, show the question number in which og books. what is relation between x(k+1) and x (k) there is no relation and the question is wrong.
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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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31 Oct 2013, 02:03



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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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02 Apr 2014, 23:00
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Here is an algebraic approach in case the GMAT tests us with a similar question where the no of elements are too big to list out and solve. Since each term in the sequence from X1 to Xk is 3 greater than the previous term, we can right a general formula, Xk=X0+k*3, inserting the values Xk=15, X0=0 15=0+k*3 k=5 Now each term from Xk to Xn is 3 less than the previous term, the general formula will be Xn=Xk(nk)*3, inserting the values Xn=0, Xk=15, k=5 0=15(n5)*3 0=153*n+15 3*n=30 n=10 Hope it makes sense
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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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17 Oct 2016, 15:53
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I got this question as part of 37 timed sample OG questions I created for myself. When I saw it, I got overwhelmed by the wording of the question and decided to blindly guess and skip it. When reviewing my wrong answers, I was able to solve it but it still took me over 3 minutes. I think this is one of the reasons that it is recommended that we solve easy and medium question in less than 1:30, and leave some time for more wordy and time consuming questions like this one. This is a classic example of how a very simple concept can be layered in the GMAT to make it seem more "difficult".



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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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29 May 2017, 22:27
tonebeeze wrote: In the sequence \(x_0, x_1, x_2, ... x_n\), each term from \(x_1\) to \(x_k\) is 3 greater than the previous term, and each term from \(x_k_+_1\) to \(x_n\) is 3 less than the previous term, where n and k are positive integers and k < n. If \(x_0\) = \(x_n\) = 0 and if\(x_k\) = 15, what is the value of n?
A. 5 B. 6 C. 9 D. 10 E. 15 In this problem, you must stay vigilant and organized. Here we know that the sequence starts at xo = 0 and works its way up to xk = 15. We then know it decreases from xk+1 to xn = 0 in increments of 3. So we know that it increases by 3 starting at 0 to 15 (5 steps) and it decreases by increments of 3 from 15 to 0 (5 steps). 5 steps + 5 steps = 10 steps.



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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk [#permalink]
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28 Mar 2018, 03:37
tonebeeze wrote: In the sequence \(x_0, x_1, x_2, ... x_n\), each term from \(x_1\) to \(x_k\) is 3 greater than the previous term, and each term from \(x_k_+_1\) to \(x_n\) is 3 less than the previous term, where n and k are positive integers and k < n. If \(x_0\) = \(x_n\) = 0 and if\(x_k\) = 15, what is the value of n?
A. 5 B. 6 C. 9 D. 10 E. 15
OPEN DISCUSSION OF THIS QUESTION IS HERE: https://gmatclub.com/forum/intheseque ... 68359.html
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Re: In the Sequence x0, x1, x2, ..., xn, each term from x1 to xk
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