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 Sep24 awarded Autobiographer May29 comment Check whether a point is within a 3D Triangle How can you have a 3D plane, planes are 2D? Aug8 awarded Student Aug6 awarded Scholar Aug6 accepted Number of Combinations from 1 to 100 Aug6 comment Number of Combinations from 1 to 100 OMG. That is just ridiculously easy when you present it like that. Thanks. Aug6 comment Number of Combinations from 1 to 100 Consider this, say I want to create a chemical mixture of 5 constituents (ie I mix together 5 different chemicals) for some sort testing. How many experiments am I required to to run, to cover all mixtures, if I am to create a grid with a concentration step (for each constituent) of 0.5%, noting that in each experiment, A + B + C + D + E = 100% Aug6 awarded Commentator Aug6 comment Number of Combinations from 1 to 100 Yes, and for example (1,99) != (99,1), the case of 2 sets is rather trivial (can do it by hand), but when there are 5 or more sets... Aug6 comment Number of Combinations from 1 to 100 @Omnitic, not subsets, pairs. But I seek to generalize for more than 3 sets, and, where the increment is smaller (say if the set is: 0, 0.5, 1, 1.5, ... 100) Aug6 comment Number of Combinations from 1 to 100 Yes they are different. Aug6 comment Number of Combinations from 1 to 100 Probably something like the total number of combinations, multiplied by a coefficient representing 1 - the probability of exceeding the limit. Aug6 asked Number of Combinations from 1 to 100 May27 awarded Supporter May20 comment What is $-i$ exactly? Yeah but it means that the reputation 'always goes up'. I wonder if we will see a reputation bubble.... May20 comment What is $-i$ exactly? Can someone explain why I cant vote down (only vote up) until I have 125 reputation? What is this, sub-prime mortgages; Is this some way to ensure net-inflationary BS stackexchange reputation? May20 comment What is $-i$ exactly? I don't agree with your first statement. The positive imaginary number line is i 2i 3i 4i...., you can also have 0i, -1i -2i -3i etc, so saying that i doesn't have any sign is as nonsensical as saying the number 1 or x or y doesn't have a sign. Dec20 comment Can't argue with success? Looking for “bad math” that “gets away with it” @Jonas Meyer, thanks. I didn't realize the power laws were constrained like that, to me they were just identities. Doesn't that then undermine the proof for Euler's Formula, where $e^{-ix}$ is divided by $e^{-ix}$ (once the derivative is proved to be constant), yielding the desired identity? Dec20 comment Can't argue with success? Looking for “bad math” that “gets away with it” Whats wrong with that? The answer could have been achieved directly, apart from that, I don't actually see anything wrong? Dec19 comment Can't argue with success? Looking for “bad math” that “gets away with it” And this whole thread is off topic from this entire site. A whole thread of incorrect proofs, please...