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Jun
11
revised How can one make sense out of a negative number?
retagged
Jun
11
revised solutions to $x^{x+y} = y^4, y^{x+y} = x$ in integers
better title
Jun
2
reviewed Approve MVT Question Calculus Past Paper
Jun
1
revised change from recurrence relation to iterative approach
retagged
May
29
revised how to prove $2^n = {n \choose 0} +{n \choose 1} + \cdots {n \choose n}$
better title; typesetting
May
29
comment Escape probabilities in a random walk.
@calculus Because the questions are both about how to treat biased random walks. Cheers!
May
29
comment Mathematical Way To find how many complex numbers
For general values of $5$, this is the Circle Problem of Gauss: en.wikipedia.org/wiki/Gauss_circle_problem
May
29
comment Escape probabilities in a random walk.
Related (duplicate?): math.stackexchange.com/questions/153123/…
May
29
answered Conditional probability calculation (multivariate distribution)
May
29
comment Identity Element and Identity Properties
You're welcome.
May
29
answered Identity Element and Identity Properties
May
29
revised How to sketch $-3x^2 - 8xy + 3y^2 = 1$
improved title
May
26
comment some series about :On some strange summation formulas by R. William Gosper
Can you please give the equation numbers of these formulas? Or at least give the page numbers where they appear in the paper. That would help. Thanks!
May
26
revised some series about :On some strange summation formulas by R. William Gosper
added link to paper
May
26
comment interpreting wording of probability question
Yes, that is correct.
May
18
revised solving $a = \sqrt{b + x} + \sqrt{c + x}$ for $x$
better title; another tag
May
15
revised solving $ x = \frac{a}{a+b} $ for a
better title
May
15
revised Expected number of throws of 6 dice until all 6 faces appear
better title; removed non-relevant tags
May
15
comment Expected number of throws of 6 dice until all 6 faces appear
What have you tried? What do you know? Are you familiar with the concept of expectation?
May
11
comment What is known about multi-perfect numbers?
The references here look like a good place to start: oeis.org/A007691