Questions about the Oct.29 subject tests

Forum for the GRE subject test in mathematics.
mitcims
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Joined: Wed Jul 27, 2016 11:34 pm

Questions about the Oct.29 subject tests

Postby mitcims » Sat Oct 29, 2016 7:44 pm

I have two questions about Oct.29 subject tests

Problem 1: [deleted]

Problem 2: [deleted]

BCLC
Posts: 13
Joined: Mon Oct 24, 2016 1:10 am

Re: Questions about the Oct.29 subject tests

Postby BCLC » Sat Oct 29, 2016 7:59 pm

I didn't see these questions. Is the GRE supposedly the same everywhere?

BCLC
Posts: 13
Joined: Mon Oct 24, 2016 1:10 am

Re: Questions about the Oct.29 subject tests

Postby BCLC » Sat Oct 29, 2016 8:01 pm

mitcims wrote:I have two questions about Oct.29 subject tests

Problem 1: [deleted]


I think you forgot +C. I think pi/4.

PS I didn't see that question on my GRE

mitcims
Posts: 3
Joined: Wed Jul 27, 2016 11:34 pm

Re: Questions about the Oct.29 subject tests

Postby mitcims » Sat Oct 29, 2016 8:03 pm

BCLC wrote:I didn't see these questions. Is the GRE supposedly the same everywhere?


Sorry I haven't heard of this. This is taken from the test in U.S. The second problem is among the last few questions, it seems.

spablo
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Joined: Thu Oct 27, 2016 10:51 am

Re: Questions about the Oct.29 subject tests

Postby spablo » Sat Oct 29, 2016 8:43 pm

Also, I think that's a little unfair that they would test different questions for the same test, especially since I thought the second problem was one of the hardest on the test. But I suppose they figure out the distribution by seeing how everyone performs on each version.
Last edited by spablo on Tue Nov 01, 2016 11:51 pm, edited 1 time in total.

ghjk
Posts: 81
Joined: Sat Apr 21, 2012 8:42 pm

Re: Questions about the Oct.29 subject tests

Postby ghjk » Sat Oct 29, 2016 11:01 pm

spablo wrote:The +C gets eliminated regardless in the first problem because of the initial value. I believe I likely put π/4 for this one. I didn't even consider 3π/4.

Problem 2 I remember it saying that [deleted]? But i didn't really attempt this problem during the test because I was running out of time.



I got the same answer as you did for the first question. For the 2nd one, I think we would need [deleted].

ghjk
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Joined: Sat Apr 21, 2012 8:42 pm

Re: Questions about the Oct.29 subject tests

Postby ghjk » Mon Oct 31, 2016 3:26 pm

Anyone remembers the given answer choices of a question involving the limit of the term a_n where a_n is the series similar to n/(n^2+k)?

pat2211
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Joined: Mon Sep 21, 2015 1:09 am

Re: Questions about the Oct.29 subject tests

Postby pat2211 » Mon Oct 31, 2016 3:34 pm

ghjk wrote:Anyone remembers the given answer choices of a question involving the limit of the term a_n where a_n is the series similar to n/(n^2+k)?

pi/4, it's a Riemann sum

MathCat
Posts: 136
Joined: Thu Oct 23, 2014 12:17 am

Re: Questions about the Oct.29 subject tests

Postby MathCat » Mon Oct 31, 2016 7:00 pm

When you took the test, you all had to sign an agreement stating that you would not discuss the exam problems.

bhauryal
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Joined: Mon Aug 01, 2016 11:53 am

Re: Questions about the Oct.29 subject tests

Postby bhauryal » Tue Nov 01, 2016 11:44 am

ghjk wrote:Anyone remembers the given answer choices of a question involving the limit of the term a_n where a_n is the series similar to n/(n^2+k)?

Do you mean a_n= n/(n^2+k^2), that would be pi/4.

ghjk
Posts: 81
Joined: Sat Apr 21, 2012 8:42 pm

Re: Questions about the Oct.29 subject tests

Postby ghjk » Tue Nov 01, 2016 2:13 pm

bhauryal wrote:
ghjk wrote:Anyone remembers the given answer choices of a question involving the limit of the term a_n where a_n is the series similar to n/(n^2+k)?

Do you mean a_n= n/(n^2+k^2), that would be pi/4.


Not sure whether it's k or k^2. Somehow I don't remember seeing $pi/4$ as one of the answer choices. Either case, I think I got this one wrong (realize the Riemann sum, but could not figure out the bounds and the correct function man. How ridiculous that is:D)

smirnov
Posts: 1
Joined: Wed Nov 02, 2016 10:46 am

Re: Questions about the Oct.29 subject tests

Postby smirnov » Wed Nov 02, 2016 10:49 am

ghjk wrote:
bhauryal wrote:
ghjk wrote:Anyone remembers the given answer choices of a question involving the limit of the term a_n where a_n is the series similar to n/(n^2+k)?

Do you mean a_n= n/(n^2+k^2), that would be pi/4.


Not sure whether it's k or k^2. Somehow I don't remember seeing $pi/4$ as one of the answer choices. Either case, I think I got this one wrong (realize the Riemann sum, but could not figure out the bounds and the correct function man. How ridiculous that is:D)


If I'm thinking of the same problem, it was an infinite product, not a sum, with all terms less than 1. The third or fourth partial product was smaller than all but one of the answers, so it was that one :D

ghjk
Posts: 81
Joined: Sat Apr 21, 2012 8:42 pm

Re: Questions about the Oct.29 subject tests

Postby ghjk » Wed Nov 02, 2016 12:07 pm

smirnov wrote:If I'm thinking of the same problem, it was an infinite product, not a sum, with all terms less than 1. The third or fourth partial product was smaller than all but one of the answers, so it was that one :D


That one is different though...And it's all telescoping in that one...But I think we should stop discussing in public here:D




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