Free GRE Prep Hour: Combinatorics on the GRE
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- Опубліковано 23 вер 2024
- Twice monthly, Manhattan Prep hosts a free, one-hour GRE prep session lead by one of our 99th-percentile GRE instructors.
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In this session, GRE instructor Jerry Alexander guides you through GRE content drawing from the 5 lb. Book of GRE Practice Problems.
Jonny has six pairs of pants, fourteen shirts, and seven hats - how many different outfits can he make? Ugh. Combinatorics problems can be intimidating and annoying, for sure. But in this hour, we'll learn the simple skills you need to master them on the GRE, working through increasingly harder problems. By the end, you'll have everything you need to own this topic!
1:00 Intro to Combinatorics
2:20 Warm-up question
5:55 The Slot Method
9:50 Question 1
12:45 Question 2
17:00 Question 3
23:40 Picking groups, added difficulty
28:00 Question 4
32:30 Question 5
37:05 Question 6
42:00 Question 7
47:20 Question 8
52:15 Question 9
56:40 Question 10
1:02:45 Recap
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very helpful! but the last problem was wrong with the first option, so the answer will be 540, and the second one is 1350, so the total combination is (540 + 1350 = 1890).
Hi, Anish! I'm glad that the lesson was beneficial to you! And, great catch. You are correct that the final answer should be 1890 - in the options, I canceled the 4s, when they should have reduced to 2. The actual number for 1 protein should be 540, the actual number for 2 proteins should be 1350. Apologies for the error!
@@manhattanprepgre7390 Thanks for replying to this, I also got 1890 and was quite confident until I saw your answer. Great series so far.
❤❤❤
yeah u are correct for a minute i was confused how he got 270 and 675
YOU ABSOLUTE GOAT, I use to struggle with these questions. Now i answer them correctly in half the time
Glad to be here
Hi, YJR. We're glad to have you here! :)
Thank you helpful gre lessons! But Last problem was not right. Of course ,You are the best teacher this section.Good luck!
Hi, Urozaliyev! Thanks for that - both the compliment, and the great catch on the final question! We're so glad that you enjoyed the video. And, you are - the answer for that final question should actually be 1890 - in the options, I canceled the 4s, when they should have reduced to 2. The actual number for 1 protein should be 540, the actual number for 2 proteins should be 1350. Apologies for the error!
Awesome. Like Cat Powell
There is a mistake at 1:00:09. The teacher cancels 4 with 2x1 without retaining 2 in the numerator. Same mistake at 1:03:29. @anishjoshi1999 is right, 1890
Hey, Dmitry! Good catch!
You're totally right, I made the same mistake again *facepalm.* Sorry about that! It should only cancel to 2, making the end result 540, not 270.
And, the final question should have been 1890 - in the options, I canceled the 4s, when they should have reduced to 2. The actual number for 1 protein should be 540, the actual number for 2 proteins should be 1350.
Apologies for those errors!
2! does not equal 4 but he solves it as such on the last taco problem
Very helpful. But I think the math was wrong for the very last question
Hi, Shaq. I'm glad you found the lesson helpful! And good catch - in the options, I canceled the 4s, when they should have reduced to 2. The actual number for 1 protein should be 540, the actual number for 2 proteins should be 1350, and the final answer should be 1890. Apologies for the error!