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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 $24$
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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