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songoku's latest activity
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songoku
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WWGD's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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How about this: Starting with 5 identical balls, there is a total of 5!=120 arrangements. Now consider the distinction. Then: By...
Sep 30, 2025
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songoku
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Gavran's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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For more complicated problems than this one in the original post the formula is $$...
Sep 30, 2025
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songoku
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Gavran's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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You do not need any formula to solve this problem. With two blue balls and two red balls you have two cases BBRR and BRBR. How many...
Sep 30, 2025
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songoku
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JimWhoKnew's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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For the case 1 yellow, 2 red, 2 blue, I get 6 arrangements in a circle, which is the same as (5-1)!/(2!2!1!) . How many do you get? For...
Sep 30, 2025
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songoku
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PeroK's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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The idea of fixing the yellow ball is that it picks out the set of solutions that cannot be equivalent under rotation. If there were...
Sep 30, 2025
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songoku
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JimWhoKnew's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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Let's take a closer look at your 2 red balls and 2 blue example. The number of combinations for arranging them in a row is 4!/(2!2!)=6...
Sep 30, 2025
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songoku
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WWGD's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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And assume balls of the same color are undistinguishable, i.e. , b1b2= b2b1, etc.?
Sep 30, 2025
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songoku
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PeroK's post
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
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I assume that two arrangements are considered equal if they are equal after rotation? If so, you could start by fixing the position of...
Sep 30, 2025
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songoku
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Finding the number of ways to arrange identical balls in a circle (3 different colors)
.
Yes. Let R = red ball and B = blue ball. Arrangement of BBRR in circle will be the same as BRRB So, the strategy is to list all the...
Sep 22, 2025
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songoku
posted the thread
Finding the number of ways to arrange identical balls in a circle (3 different colors)
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Precalculus Mathematics Homework Help
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I tried to combine those 2 formulas but it didn't work. I tried using another case where there are 2 red balls and 2 blue balls only so...
Sep 22, 2025
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songoku
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I am thrilled and honored to announce that @berkeman has accepted a role as PF Admin! @berkeman has 20 impactful years at PF under his...
Aug 7, 2025
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songoku
replied to the thread
Limit of piecewise function using epsilon delta
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I am very sorry for late reply Thank you very much for all the help and explanation pasmith, PeroK, FactChecker, BvU, Gavran...
Aug 7, 2025
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songoku
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FactChecker's post
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Limit of piecewise function using epsilon delta
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Sorry, my mistake. I didn't realize that this example is different from the one in post #1. In this example, one function equation works...
Aug 7, 2025
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songoku
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PeroK's post
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Limit of piecewise function using epsilon delta
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That's not really how we are supposed to construct a proof here. Instead, for ##0<\epsilon <1##, we should let: $$\delta =...
Aug 7, 2025
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songoku
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Gavran's post
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Limit of piecewise function using epsilon delta
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The post #15 was my mistake. When ## x\to 2^- ## ## \sqrt[3]{8-\epsilon}-2\lt x-2\lt\sqrt[3]{8+\epsilon}-2 ## does not imply ##...
Aug 7, 2025
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