User Henry - Mathematics Stack Exchange

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$m$ balls $n$ boxes probability problem

answered Mar 12, 2011 at 14:58

14 votes

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Secretary problem - why is the optimal solution optimal?

answered Jun 14, 2011 at 8:18

14 votes

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Limit of integration can't be the same as variable of integration?

answered Feb 14, 2012 at 0:27

14 votes

Finding the missing digits of $23!$

answered Aug 21, 2015 at 17:16

14 votes

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Are $X$ and $X+Y$ independent, if $X$ and $Y$ are independent?

answered Apr 7, 2015 at 16:28

13 votes

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People sitting in a circle chewing gum

answered Aug 3, 2015 at 5:50

13 votes

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If $X$ is normal, is $\exp(X)$ still normal? How to find its mean and variance?

answered Feb 2, 2014 at 18:01

13 votes

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Probablity of drawing all the red balls while blue and green are still left

answered Jun 19, 2014 at 8:29

13 votes

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Solution to Locomotive Problem (Mosteller, Fifty Challenging Problems in Probability)

answered Feb 20, 2012 at 23:10

13 votes

What is the probability that a solitaire game be winnable?

answered Mar 17, 2012 at 19:35

13 votes

Why is sum of a sequence $\displaystyle s_n = \frac{n}{2}(a_1+a_n)$?

answered Jun 12, 2011 at 13:46

13 votes

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Prove that $6|2n^3+3n^2+n$

answered Jun 26, 2011 at 7:56

13 votes

What does Khan Academy have to offer? Depth? Rigor?

answered Nov 8, 2011 at 15:09

13 votes

Probability question about married couples

answered Sep 29, 2011 at 17:06

13 votes

Which functions satisfy $f^n(x) = f(x)^n$ for some $n \ge 2$?

answered Aug 3, 2018 at 20:53

13 votes

Can the perimeter of a convex polygon X be an odd number?

answered Dec 6, 2021 at 13:58

12 votes

Regarding a Coin Toss Experiment by Neil DeGrasse Tyson, and its validity

answered May 24 at 19:57

12 votes

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Without calculator prove that $9^{\sqrt{2}} < \sqrt{2}^9$

answered Jan 4, 2023 at 12:53

12 votes

Hilbert's hotel: why can't I repeat it infinitely many times?

answered Sep 19, 2019 at 8:00

12 votes

History of zero?

answered Jun 3, 2011 at 8:12

12 votes

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Distribution of days in a week on Christmas

answered Mar 21, 2011 at 18:48

12 votes

the number of Young tableaux in general

answered Mar 9, 2011 at 1:32

12 votes

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Give an example of a function $f\colon\mathbb{R}\to\mathbb{R}$ which is continuous except at the integers

answered Oct 15, 2012 at 20:44

12 votes

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How many positive integers between 50 and 100 are divisible by 7?

answered Dec 8, 2012 at 21:35

12 votes

Does $m(E)>0$ imply that $E$ must contain a nondegenerate interval?

answered Oct 26, 2013 at 20:59

12 votes

A Combinatorics question whose solution I can't understand.

answered Nov 19, 2014 at 14:28

11 votes

What's the inverse operation of exponents?

answered Oct 3, 2014 at 11:46

11 votes

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Minesweeper probability

answered Aug 28, 2015 at 14:26

11 votes

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What is the probability distribution on integers?

answered Nov 30, 2012 at 11:45

11 votes

How do I calculate the derivative of $x|x|$?

answered Jan 7, 2013 at 23:57

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5,856 Answers

$m$ balls $n$ boxes probability problem

Secretary problem - why is the optimal solution optimal?

Limit of integration can't be the same as variable of integration?

Finding the missing digits of $23!$

Are $X$ and $X+Y$ independent, if $X$ and $Y$ are independent?

People sitting in a circle chewing gum

If $X$ is normal, is $\exp(X)$ still normal? How to find its mean and variance?

Probablity of drawing all the red balls while blue and green are still left

Solution to Locomotive Problem (Mosteller, Fifty Challenging Problems in Probability)

What is the probability that a solitaire game be winnable?

Why is sum of a sequence $\displaystyle s_n = \frac{n}{2}(a_1+a_n)$?

Prove that $6|2n^3+3n^2+n$

What does Khan Academy have to offer? Depth? Rigor?

Probability question about married couples

Which functions satisfy $f^n(x) = f(x)^n$ for some $n \ge 2$?

Can the perimeter of a convex polygon X be an odd number?

Regarding a Coin Toss Experiment by Neil DeGrasse Tyson, and its validity

Without calculator prove that $9^{\sqrt{2}} < \sqrt{2}^9$

Hilbert's hotel: why can't I repeat it infinitely many times?

History of zero?

Distribution of days in a week on Christmas

the number of Young tableaux in general

Give an example of a function $f\colon\mathbb{R}\to\mathbb{R}$ which is continuous except at the integers

How many positive integers between 50 and 100 are divisible by 7?

Does $m(E)>0$ imply that $E$ must contain a nondegenerate interval?

A Combinatorics question whose solution I can't understand.

What's the inverse operation of exponents?

Minesweeper probability

What is the probability distribution on integers?

How do I calculate the derivative of $x|x|$?