dREaM
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 Feb 1 answered How many numbers between $0$ and $1,000,000$ have exactly one digit equal to $9$ and the sum of digits equal $13$? Feb 1 comment Find the remainder when ${{5^5}^5}^5$ is divided by $24$ It is euler's totient function. Feb 1 revised Is there an expression for the sum of $\binom nr^2$ for each $n$? added 2 characters in body Feb 1 comment Is there an expression for the sum of $\binom nr^2$ for each $n$? yes, thank you. Feb 1 comment Find the remainder when ${{5^5}^5}^5$ is divided by $24$ Nice, using $\lambda$ is like using $\varphi$ but quicker. Feb 1 revised Find the remainder when ${{5^5}^5}^5$ is divided by $24$ added 1 character in body Feb 1 comment Is the function unbounded on $[a,b]$ if there is a removable discontinuity in between $a$ and $b$? @JimmyK4542 I think he means a non-removable discontinuity. Feb 1 revised Find the remainder when ${{5^5}^5}^5$ is divided by $24$ added 6 characters in body Feb 1 comment Find the remainder when ${{5^5}^5}^5$ is divided by $24$ For sure, although the other aproach works in more cases. Feb 1 revised Find the remainder when ${{5^5}^5}^5$ is divided by $24$ added 358 characters in body Feb 1 answered Find the remainder when ${{5^5}^5}^5$ is divided by $24$ Feb 1 comment Distance of centroid to incenter centroid is intersection of medians right? Feb 1 answered Show that for $p \neq 2$ not every element in $\mathbb{Z}/p\mathbb{Z}$ is a square. Feb 1 comment Mathematical usage of “$\dots$” during enumeration, is it ok to be imprecise? done${}{}{}{}$, thanks. Feb 1 revised Mathematical usage of “$\dots$” during enumeration, is it ok to be imprecise? added 1 character in body Feb 1 comment Tim and Jim are tossing a coin. Tim gets 1$for heads, Jim for tails. Pr( heads ) = p. What are the odds that…(details inside)? We can model it as a markov chain, but I don't really know how to find the probability. It is easy to aproximate it with a computer. Feb 1 asked Mathematical usage of “$\dots$” during enumeration, is it ok to be imprecise? Jan 31 comment Is there an expression for the sum of$\binom nr^2$for each$n$? this is called Vandermonde's identuty. Jan 31 comment Is there an expression for the sum of$\binom nr^2$for each$n$? Added${}{}{}{}{}$Jan 31 revised Is there an expression for the sum of$\binom nr^2$for each$n\$? added 329 characters in body