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Sep
1
comment What are the odds of spinning matching items in a slot machine?
Not everyone is so forthcoming with their vote justifications. (It wasn't me)
Sep
1
comment Subset vs. Proper subset
This is also like divisors. The divisors of $8$ are $1,2,4,8$, but the proper divisors of $8$ are $1, 2, 4$.
Aug
31
answered Proof of stars and bars formula
Aug
31
comment Proof of stars and bars formula
"What is wrong here?" - you claim to have demonstrated (0,0,6). How would you demonstrate (0,6,0) or (6,0,0)?
Aug
31
comment Proof of stars and bars formula
^ exactly. You aren't choosing gaps between balls; you are literally choosing balls. The chosen balls become the boundaries of the boxes.
Aug
27
comment defective component and probability
en.wikipedia.org/wiki/…
Aug
27
comment Intuitive explanation for p ∨ q → r ≡ ( p → r) ∧ (q → r)
The right hand side is "P is a road that leads to R, and Q is a road that leads to R"; the left hand side is "You can get to R by either of the roads P and Q"
Aug
25
comment Which is more simplified: $a\sqrt{b}$ or $\sqrt{c}$?
I've seen "simplified" to mean "the radicand is square-free".
Aug
19
awarded  Famous Question
Jul
27
comment Mistakes in $\lim_{a\to \infty}(a^2 - a) = - \frac{1}{6}$?
Why do you accept that the sum of the positive integers is $-1/12$?
Jul
27
comment How to show $\sqrt{|x|}$ is not Lipschitz continuous?
Suppose that the derivative IS bounded (by L). Then you can find $x_0$ such that $f'(x_0) \geq L$
Jul
27
reviewed Approve Systems of equations word problem
Jul
27
comment Systems of equations word problem
The amount of gold is $85.93$g. This equals the amount of gold from the first alloy, which is $.77x$, plus the amount from the second alloy, $.96$y.
Jul
26
comment Systems of equations word problem
Well $x + y = 100$, for starters.
Jul
26
comment Finding how much percent passed in both Maths and English
Stop using x! The value of x is $1$ (!) because it is the PROPORTION/PERCENT of students, and that total is 1 (100%).
Jul
26
answered Finding how much percent passed in both Maths and English
Jul
26
comment Finding how much percent passed in both Maths and English
Draw a Venn diagram. Forget the fractions.
Jul
24
comment Why are values greater than $\pi$ radians given as negative in exponential form?
mathworld.wolfram.com/ComplexArgument.html
Jul
21
comment Solving $6 \cos x - 5 \sin x = 8$
The correct problem is revealed
Jul
16
comment Mod question: $-5 \pmod 3$?
$$-5 \equiv 1 \pmod 3$$ because $3|(-5 - 1)$