Reddit » Learn Math
by /u/Ok_Giraffe5484
12h ago
I'm following a video by The Organic Chemistry Tutor on YT. I'm confused as to why I can't cancel out the 7xy/5xy to become 7/5. https://imgur.com/a/Jop4T83 https://imgur.com/a/yikiOE4 And a second question, I'm also a little confused why both the top and bottom are both times by xy as opposed to x for the numerator and y for the denominator. Here's where I tried that and got an incorrect answer: https://imgur.com/a/iIi2OIZ My guess as to why I was something to do with the 7 plus in the numerator and 5 minus in the denominator. Happy to clarify if this is hard to understand. Thank you in adva ..read more
Reddit » Learn Math
by /u/Think_Cantaloupe_677
12h ago
I'm a bit confused why we have to divide by r!; why is it specfically r or not like say n? submitted by /u/Think_Cantaloupe_677 [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/Think_Cantaloupe_677
12h ago
We're learning permutations and combinations at school and I'm familar with the form nCr and nPr, but ive encountered questions in the textbook where it involvings proofs; but im more concerned about variations of the forms where it would be like nP(r-1) or nC(r-1); what does r-1 mean? what does it mean and how is it any different to just r? is it also possible to have cases where there are variations of 'n' so like n-2? submitted by /u/Think_Cantaloupe_677 [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/Coxless_Amir
12h ago
right now, I'm studying Gilbert's 18.06sc lin_alg (pls chill, i have passed a pure mathematical linear algebra course last semester. I know the concepts algebraically) I'm passed through the first 1/3 of the course, meaning i know the things below : Elimination Solving Ax=b 4 fundamental subspaces inverse matrices when solving the first exam, i came across this question : picture there's 3 things i don't understand here : How does column 2 show the relationship between col1 and col2? Why is column 3 all zeros? How do we know if a column doesn't contain a pivot, then it must be dependent ..read more
Reddit » Learn Math
by /u/Mahjoung007
12h ago
I manage the marketing for an e-commerce website that sells vouchers for various services, including activities, spas, food and beverages, and automotive services. Each month, I allocate a budget for marketing activities based on the offers available at the time. However, I encounter several challenges that make budget optimization difficult: New offers are often introduced after the budget has been phased out. Existing offers sometimes undergo changes, such as price adjustments or modifications in the terms and conditions. Some offers are discontinued unexpectedly during the month. These f ..read more
Reddit » Learn Math
by /u/SnooStories6404
12h ago
When the highest eigenvalue has multiplicity of one it's easy. submitted by /u/SnooStories6404 [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/houssineo
12h ago
Guys do you know any kind of website or book that give you a logic puzzles which help you to improve you thinking and how to approach to the problems submitted by /u/houssineo [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/Nervous-Reserve-8590
12h ago
https://www.springernature.com/gp/-/20156230 Anyone knows why the promo code is not working? Thank you. submitted by /u/Nervous-Reserve-8590 [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/Dyasoma
12h ago
is there a number a s.t a + b = a for all values b? submitted by /u/Dyasoma [visit reddit] [comments ..read more
Reddit » Learn Math
by /u/jezik_univerzuma
12h ago
Suppose ? is a diagonal matrix with distinct entries on the diagonal and ? is a matrix of the same size as ?. Show that ??= ?? if and only if ? is a diagonal matrix. I am clueless for => direction, to prove that B is diagonal. submitted by /u/jezik_univerzuma [visit reddit] [comments ..read more

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