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ITT: Why the GRE is harder than the LSAT
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Date: May 1st, 2012 3:35 PM Author: demanding people who are hurt piazza Because social science students need to brush up on number properties, that they never learned, in order to answer questions like this:
Which quantity is greater?
A: The units digit of 13 × 13^13 B: The units digit of 19 × 19^19 |
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Date: May 1st, 2012 4:11 PM Author: Big-titted chestnut field windowlicker that's not actually very hard. questions like this are much more about reasoning than they are about math skills.
you should memorize your squares up to around 15, so you have the first one covered. honestly you should be able to figure out the units digit of for 19 in your head, but even if not you take 20 seconds to do 19^2 by hand and you have your answer. (A, ftr)
(not necessarily saying the LSAT is harder than the GRE, also ftr) |
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Date: May 1st, 2012 4:14 PM Author: bearded spectacular hospital (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590400) |
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Date: May 1st, 2012 4:16 PM Author: Carmine Appetizing Sanctuary Pisswyrm its the units digit. u only need 3 and 9. christ (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590421) |
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Date: May 1st, 2012 4:18 PM Author: Big-titted chestnut field windowlicker really? you must be one of those DE Shaw quants that's always posting on are law bort. (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590426) |
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Date: May 1st, 2012 4:18 PM Author: Carmine Appetizing Sanctuary Pisswyrm ya. im abt 2 right logarithms w/that fractal savant guy (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590434) |
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Date: May 1st, 2012 4:20 PM Author: Canary razzmatazz weed whacker wtf is a units digit ? which number? (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590452) |
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Date: May 1st, 2012 4:21 PM Author: Carmine Appetizing Sanctuary Pisswyrm excuse me? baking powder? (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590458) |
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Date: May 1st, 2012 4:36 PM Author: Lemon Shivering Tanning Salon Pocket Flask lol did you go to a ttt or something (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590564) |
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Date: May 1st, 2012 5:25 PM Author: arousing stead travel guidebook i agree that it's a very basic problem, but you shouldn't even need to have squares memorized that high; it's just basic logic (which the lsat tests). As in the lsat, just find the pattern in everything.
13*13^13=13^14. and since only units digit matters, 3^14 units digits:3^0=1 3^1=3, 3^2=9, 3^3=7, 3^4=1, at that point the pattern repeats, so 14/4=3 remainder 2. so raise by the remainder to get the units digit= 9.
19*19^19=19^20 ==> 9^20. units digits: 9^0=1, 9^1=9, 9^2=1 at that point the pattern repeats, so 20/2=10 remainder 0. so raise by the remainder to get the units digit = 1.
therefore A is correct, and should've been answered by a person of reasonable problem-solving ability in less than 30 seconds. |
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Date: May 1st, 2012 4:14 PM Author: bearded spectacular hospital lol at that being the question you pick to prove your point, just lol (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590404) |
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Date: May 1st, 2012 4:16 PM Author: Big-titted chestnut field windowlicker agreed. possible flame. (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590418) |
Date: May 1st, 2012 4:26 PM Author: mischievous supple sweet tailpipe that question is actually easy as shit since the units digit of B will be 1.
edit: and i think 7 for A (off the top of my head) |
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Date: May 1st, 2012 4:28 PM Author: Carmine Appetizing Sanctuary Pisswyrm 9. progression is 3 9 7 1. so 12 will be 1, 13 will be 3, 14 will be 9 (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590504) |
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Date: May 1st, 2012 4:30 PM Author: mischievous supple sweet tailpipe oh yeah, i fucked that up. either way, B is easy as fuck. back to studying for LS exams...
edit: i fucked this up more than i though. lol, *leaves in shame* |
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Date: May 1st, 2012 4:31 PM Author: Carmine Appetizing Sanctuary Pisswyrm u did fine breh (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590532) |
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Date: May 1st, 2012 4:28 PM Author: Bat-shit-crazy clear spot hunting ground how do you figure this out in your head? the 19 one cycles b/t 1 and 9 with odd being 1 but the 13 cycle to 9, 7, 1, and 3? (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590506) |
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Date: May 1st, 2012 4:32 PM Author: Carmine Appetizing Sanctuary Pisswyrm how wld u not figure this out in ur head? (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590533) |
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Date: May 1st, 2012 5:30 PM Author: bateful impressive blood rage nowag I have no idea how to solve that problem. Fuck my ass for never learning algebra. (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20590999) |
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Date: May 1st, 2012 5:32 PM Author: arousing stead travel guidebook it's not algebra. it's arithmetic and logic/quantitative reasoning (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20591021) |
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Date: May 1st, 2012 7:46 PM Author: vivacious submissive haunted graveyard most SS majors have never taken an arithmetic class. (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20591914) |
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Date: May 1st, 2012 7:47 PM Author: dark soul-stirring plaza useless brakes tyft (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20591919) |
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Date: May 1st, 2012 8:47 PM Author: arousing stead travel guidebook this is why ARE COUNTRY is fucked (http://www.autoadmit.com/thread.php?thread_id=1937744&forum_id=2#20592360) |