
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:23 AM
micromass

1 
38,996 
Hi! I've got a couple of questions about Sudoku.
1. How many possible Sudoku boards are there? That is, a 3x3...

Oct805 07:13 PM
ACG

0 
1,332 
Hi! I was thinking about primes and have a bit of a question. I apologize if this is too easy or obvious  I...

Mar2507 04:47 PM
Moo Of Doom

3 
1,291 
Hi! I've been dealing with a situation like this for a couple of years now and it made me start thinking...
A...

Feb2309 08:19 PM
gmax137

4 
1,449 
SO the entrance to a college is based off of two factors: 54% grade point average, and 46% supplemental application....

Aug3111 10:39 AM
ACHQ

7 
3,682 
Heres two problems from an A Level related paper: prove that if pq is irrational then atleast one of p or q is...

Oct1711 04:20 AM
logics

4 
2,883 
I dont understand the concept (or need for) of vacuous truths/implications. Why is it that if say a statement a is...

Nov1011 01:38 AM
Deveno

43 
4,783 
It seems to me (though I would be *extremely* glad to be proven wrong here) that in mathematics we often blindly...

May3012 07:06 PM
TacTics

15 
2,725 
Hi, I was just reading up on some material for one of my exams and came across something. I realize this may seem...

Dec1106 04:32 AM
nworm

9 
1,377 
if given two points each with different x and y coordinates, what is the best way to define the error between these...

Jul1207 01:24 PM
matt grime

4 
988 
Why is it not possible to have the log of a negative number?
Examples would be greatly appreciated.
Furthermore,...

Oct413 08:06 AM
HallsofIvy

2 
658 
Hi!!! im amateur in mathemathicals growth models but im doing my graduated work in adjust five differents models in...

Jan2811 10:13 AM
acocac

3 
651 
Is the statement 1<1/0<1 decidable using the ordered field/real number axioms and first order logic? I have tried to...

Sep308 05:36 PM
ad infinitum

5 
1,834 
I'm stumped as to how to find a formula for the number of pairs QN*QN between 1 and p1. I must use the following as...

Apr2803 01:18 AM
Ad Infinitum NAU

7 
1,574 
You have 10 days of numbers that are averaged together (10 day avg). The most recent 3 days of numbers also averaged...

Aug508 05:20 PM
AD1985

2 
1,314 
Hello All, I need help making sure I am right about this. Say for example I have these two functions: f(n) = 2^n and...

Sep2208 02:07 PM
Ad2d

5 
851 
Can anyone give me examples of "infinity" in the physical world around us? Ie. evidence of its existence as more than...

Dec903 04:34 PM
BigRedDot

19 
1,998 
I first read this story in New Scientist when I was collecting it. Here are some highlights:
The article has...

Dec503 06:23 PM
motai

4 
1,398 
Hi Folks.
I was hoping to pick the brains of some of the mathematicians and mathematically inclined on this site.
...

Mar1811 07:02 AM
Deveno

8 
3,650 
if i integrate d/dx(x^2), should i include the constant of integration? thanks

Feb405 11:56 AM
HallsofIvy

4 
1,093 
this is quite a classic problem i think but im having difficulty finishing it off. If we have two stamps of positive...

Feb1005 11:24 AM
robert Ihnot

4 
1,200 
does any one know a proof for the solution to the frobenius problem for n=2? that is, that the smallest not possible...

Feb1005 06:06 PM
mathwonk

3 
945 
hey, i was just wondering if anyone could help find the sum of the infinite series defined by 1/. I can split it into...

Nov209 03:10 PM
TRUSKY1965

14 
18,782 
if we know that an infinite series is convergent from an integer T, to infinity, then the series is convergent from 1...

May1305 02:18 AM
Galileo

4 
1,077 
if you are given f(x,y)=x^2+y^2 and y=cos(t) x=sin(t), then when you differentiate f with respect to t, you use the...

May1505 09:17 AM
whozum

14 
1,198 
Suppose you are conducting a hypothesis test to compare two sample means from independent samples, with the variance...

May2305 12:01 PM
uart

2 
40,795 
Hi everyone,
I'm working with an online graphing program desmos.com. It's great, and actually tons of fun.
I'm...

Apr314 09:00 PM
Simon Bridge

7 
552 
I feel like a total noob, but my friend is reviewing distance formula and asked for my help. I can't seem to get the...

Aug2812 09:55 AM
azizlwl

6 
1,159 
Hi there,
I have a question regarding this statement:
http://i46.tinypic.com/35jvtvt.png
My question is...

Jun2212 06:46 PM
adarpodracir

5 
1,059 
Dear All,
Currently I'm working out a formula for Destroyers in the online game BattleGround Europe to be able to...

Aug2306 03:53 PM
Adder_Noir

15 
1,494 
Dear All,
After the great help I received last time I couldn't think of a better place to be asking this question....

Aug2806 06:19 AM
Adder_Noir

2 
2,298 
Hi,
I'm looking for a recommendation for a good textbook which will deepen my understanding of...

Jun1707 05:56 AM
Adder_Noir

5 
3,014 
Hi,
Just reading through a good physics book about games and came across some stuff on complex numbers. The book...

Jul308 07:34 PM
Adder_Noir

14 
1,933 
Hi!,
I'm well into the world of computer graphics. Love to say it was great but well, it isn't.
I would like to...

Jul3110 10:22 PM
Adder_Noir

1 
771 
I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function
Y = a + b /(1 +...

Jan2612 11:58 PM
Ade Solm

0 
1,163 
I have a test tomorrow and there are 2 question I am stuck on
Five patrons check their coats at a theatre. In the...

Dec203 08:24 AM
metacristi

1 
1,512 
Im not sure if this is the right place, but I have an optimization problem where I assume we are supposed to use the...

Dec1605 11:03 PM
uart

3 
1,756 
Hi,
I have this double summation expression to solve as part of matlab code I am writing. I have searched matlab no...

Feb2412 05:03 PM
Office_Shredder

5 
6,046 
Hi,
Please I need your assistance on this matlab code. I will really appreciate it.
R=0.492; Pw=0.3708;
for...

May212 12:54 AM
chiro

4 
4,166 
Dear All,
Please I need your assistance in solving this matlab problem. I will be glad to hear from you as early as...

May1312 01:09 AM
Stephen Tashi

1 
931 
Hi,
Please assist,
I write this matlab function and receive the error below
function...

May1612 07:03 AM
Malle

1 
1,012 