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Activity for wizzwizz4‭

Type On... Excerpt Status Date
Edit Post #283399 Initial revision about 3 years ago
Answer A: Intuitively, if you pick k out of n objects singly without replacement, why's the number of possible outcomes NOT $n(n-1) \dots [(n-(k - 1)]\color{red}{(n - k)}$?
Each term of that product gives the size of the pool when you pick an object out – it's the number of possible items you can pick out at that moment, if you're picking them one at a time. Once you've taken $k$ items out of a pool of $n$ items, there are $n - k$ objects left over. This means that, ...
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about 3 years ago
Edit Post #283398 Initial revision about 3 years ago
Question Finding the smallest Mersenne-number multiple of an odd integer
Problem Given an odd integer $a$, there exists some smallest $b$ such that $a\times b = 2^n-1$ (for some $n$). Find $b$ and $n$. What is an upper bound for this problem? What is a lower bound for this problem? In what cases is it easier? Naïve algorithm I know I can count up all ...
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about 3 years ago
Comment Post #283300 A tip: meta is for people to _decide on_ policies, more so than just to document them. While it's useful to describe what you've observed the policy to be in practice, a meta answer should be phrased as a definitive answer – and then people can downvote it if they disagree (so it looks like a definit...
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about 3 years ago
Comment Post #278772 If (if) we're modifying the Markdown parser, I wonder whether replacing MathJax with [KaTeX](https://katex.org/) would be a good idea, too.
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about 4 years ago
Comment Post #278772 Shouldn't the Markdown parser treat `$` and `$$` specially, then?
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about 4 years ago
Edit Post #278763 Initial revision about 4 years ago
Question Mathjax does not render new lines
I can't make a new-line in MathJax. Markup: $$1 + 2 \\ 3$$ Result: $$1 + 2 \\ 3$$ It's supposed to look something like this (but centred): $1 + 2$ $3$
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about 4 years ago
Edit Post #278141 Post edited about 4 years ago
Suggested Edit Post #278141 Suggested edit:
An $s$-sided dice has faces 1–$s$.
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helpful about 4 years ago