1 00:00:19,819 --> 00:00:26,539 If you tell me Farm X uses organic compost and therefore its crops are toxin 2 00:00:26,679 --> 00:00:31,119 free, you have built an argument with a massive hole in it, 3 00:00:31,179 --> 00:00:34,739 um, a gap so wide you could drive a tractor through it. 4 00:00:36,242 --> 00:00:41,523 Right, because using organic compost does not automatically mean there are zero 5 00:00:41,602 --> 00:00:46,822 toxins, I mean, not unless every single batch of organic compost completely 6 00:00:46,902 --> 00:00:49,062 eliminates every toxin known to man. 7 00:00:49,799 --> 00:00:56,019 And that distinction right there, between completely eliminating toxins and just not 8 00:00:56,119 --> 00:01:01,279 adding new ones, is where so many high scoring test takers crash and burn. 9 00:01:01,939 --> 00:01:06,940 They confuse a Sufficient Assumption with a Necessary Assumption because of a single 10 00:01:07,000 --> 00:01:08,299 word in the question prompt. 11 00:01:09,026 --> 00:01:13,526 The difference between "assumed if" and "depends on assuming." 12 00:01:14,127 --> 00:01:17,566 It is the difference between "if" and "only if." 13 00:01:18,194 --> 00:01:18,934 Precisely. 14 00:01:19,594 --> 00:01:21,654 Look at that organic compost argument. 15 00:01:22,235 --> 00:01:26,114 A Sufficient Assumption provides total logical overkill. 16 00:01:26,675 --> 00:01:29,134 It promises a hundred percent guarantee. 17 00:01:29,854 --> 00:01:34,795 If you assume "all organic compost completely eliminates all toxins," 18 00:01:35,295 --> 00:01:38,314 the conclusion is instantly, completely proven. 19 00:01:38,734 --> 00:01:39,814 It is locked down. 20 00:01:40,586 --> 00:01:45,446 Right, but a Necessary Assumption does not care about logical overkill. 21 00:01:45,826 --> 00:01:49,526 It just protects the absolute minimum baseline floor. 22 00:01:50,206 --> 00:01:55,486 If the argument claims compost makes crops toxin free, the Necessary Assumption is 23 00:01:55,506 --> 00:01:59,746 simply that "organic compost does not introduce new toxins." 24 00:02:00,466 --> 00:02:01,146 Exactly. 25 00:02:01,706 --> 00:02:06,886 If compost introduced new toxins, the whole argument collapses into dust. 26 00:02:07,566 --> 00:02:13,026 But you do not need compost to cure every toxin in existence just to keep this one 27 00:02:13,106 --> 00:02:13,986 argument standing. 28 00:02:15,251 --> 00:02:18,272 I call this the ladder versus the air test. 29 00:02:18,951 --> 00:02:23,512 A Sufficient Assumption is a giant ladder that reaches the roof all by itself. 30 00:02:23,911 --> 00:02:25,292 Boom, you are on the roof. 31 00:02:26,031 --> 00:02:30,632 A Necessary Assumption is just checking if the rungs are missing before you step on 32 00:02:30,651 --> 00:02:30,812 them. 33 00:02:31,392 --> 00:02:35,911 You are not buying a ladder, you are just making sure the floor does not give way. 34 00:02:37,049 --> 00:02:39,589 That is surprisingly accurate, Nora. 35 00:02:40,289 --> 00:02:42,489 The floor versus the ladder. 36 00:02:43,432 --> 00:02:47,512 I say that because when I was prepping and stuck in the mid 160s, 37 00:02:47,813 --> 00:02:52,753 trying to push into the 170s, I kept throwing out correct Necessary Assumption 38 00:02:52,852 --> 00:02:53,572 answer choices! 39 00:02:54,213 --> 00:02:58,072 I would eliminate them because they sounded so weak and boring. 40 00:02:58,172 --> 00:03:03,372 I was subconsciously demanding a hundred percent guarantee on every single question, 41 00:03:03,912 --> 00:03:09,032 so a choice like "compost does not introduce new toxins" felt too timid. 42 00:03:09,655 --> 00:03:15,054 And that timid choice is the exact right answer on a Necessary Assumption stem, 43 00:03:15,574 --> 00:03:17,914 while the bold guarantee is a trap. 44 00:03:18,716 --> 00:03:24,877 Okay, so let us talk strategy, because applying the wrong tool here is deadly. 45 00:03:25,576 --> 00:03:30,296 People love the Negation Test, but what happens if you try to use the Negation Test 46 00:03:30,356 --> 00:03:32,316 on a Sufficient Assumption question? 47 00:03:32,965 --> 00:03:37,025 You get a false negative almost eighty percent of the time. 48 00:03:37,704 --> 00:03:42,704 Negating a sufficient condition does not destroy the conclusion if another 49 00:03:42,764 --> 00:03:45,444 independent path to that conclusion exists. 50 00:03:46,164 --> 00:03:51,424 That is why you never, ever use negation on a Sufficient Assumption prompt. 51 00:03:52,271 --> 00:03:57,051 So what is the proper tool for Sufficient Assumption stems that say things like 52 00:03:57,411 --> 00:04:00,092 "allows the conclusion to be properly drawn"? 53 00:04:00,817 --> 00:04:01,938 Concept bridging. 54 00:04:02,638 --> 00:04:05,657 It is an equation you can write down in ten seconds. 55 00:04:06,398 --> 00:04:12,237 You isolate the unlinked premise noun, say, "compost," and the new conclusion noun, 56 00:04:12,677 --> 00:04:13,637 "toxin free." 57 00:04:14,477 --> 00:04:19,298 Your prephrase is simply Premise Term implies Conclusion Term. 58 00:04:20,157 --> 00:04:24,017 You build a bridge from compost directly to toxin free. 59 00:04:24,857 --> 00:04:25,138 Done. 60 00:04:25,736 --> 00:04:30,317 Whereas for Necessary Assumption questions, where the prompt asks what the argument 61 00:04:30,377 --> 00:04:35,656 "depends on" or "requires," you break out the surgical Negation Protocol. 62 00:04:36,276 --> 00:04:36,616 Right. 63 00:04:36,956 --> 00:04:42,036 And the trick with negation is not to negate the whole sentence into a giant mess, 64 00:04:42,536 --> 00:04:44,757 but to target the core quantifier. 65 00:04:45,502 --> 00:04:51,442 Yeah, like turning "some" into "no," or turning "at least one" into "none." 66 00:04:51,942 --> 00:04:58,102 If you negate a choice from "at least one compost batch is safe" to "no compost 67 00:04:58,182 --> 00:05:02,622 batch is safe," and the argument instantly shatters, you found your winner. 68 00:05:03,236 --> 00:05:06,036 Which brings us to the weak language paradox. 69 00:05:06,856 --> 00:05:10,877 Test takers are trained to fear strong words like "always," 70 00:05:11,337 --> 00:05:13,896 "all," "guarantees," or "every." 71 00:05:14,896 --> 00:05:20,376 On Necessary Assumption questions, those extreme words are usually red flags because 72 00:05:20,437 --> 00:05:23,837 the author rarely needs that much strength to support the floor. 73 00:05:24,382 --> 00:05:29,622 But on Sufficient Assumption questions, extreme language is your best friend! 74 00:05:30,222 --> 00:05:34,963 You want words like "all" or "guarantees" because you are trying to build that 75 00:05:35,083 --> 00:05:37,143 unstoppable ladder to the roof. 76 00:05:38,860 --> 00:05:39,599 Exactly. 77 00:05:40,240 --> 00:05:45,560 Strong language is a virtue when you need a guarantee, but a vice when you only need 78 00:05:45,659 --> 00:05:46,380 a requirement. 79 00:05:47,048 --> 00:05:51,108 And if people want to practice target drilling these specific stems, 80 00:05:51,688 --> 00:05:57,227 LSAC actually offers drill sets focusing on specific types of Reading Comprehension 81 00:05:57,307 --> 00:06:00,327 and Logical Reasoning questions right inside LawHub. 82 00:06:00,942 --> 00:06:03,262 That targeted practice is critical. 83 00:06:03,962 --> 00:06:08,803 If you do not isolate these stems, you will keep using bridging on Necessary 84 00:06:08,923 --> 00:06:13,522 questions and negation on Sufficient questions, and you will stay trapped in the 85 00:06:13,722 --> 00:06:14,282 160s. 86 00:06:14,962 --> 00:06:19,222 So remember, ask yourself: am I building a ladder to the roof, 87 00:06:19,662 --> 00:06:22,202 or am I just checking the rungs under my feet? 88 00:06:22,982 --> 00:06:28,242 Know the prompt, pick the right tool, and do not fear weak language when all you 89 00:06:28,302 --> 00:06:29,202 need is a floor.