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Jul
15
answered Is this Goldbach-type problem easy to solve?
Jul
15
comment Is this Goldbach-type problem easy to solve?
what is $\{p,q\}$?
Jul
15
comment We throwing $m$ balls to $n$ cells…
stars and bars is a method for counting what you want to count: here is a reference E(X) is the final formula.
Jul
15
answered We throwing $m$ balls to $n$ cells…
Jul
15
comment Any way to represent number that comes after repeating decimal?
the limit as n approaches infinity of $10^{-n}$ is 0. So your method tells you .99999.... 8 is exactly the same as .999999...9
Jul
15
answered Any way to represent number that comes after repeating decimal?
Jul
15
answered Help with finding a pattern
Jul
15
comment Given a polygon of n-sides, why does the regular one (i.e. all sides equal) enclose the greatest area given a constant perimeter.
but did you prove it for all quadrilaterals or only rectangles?
Jul
15
comment generating function combinatorics solution
He just used the binomial theorem
Jul
15
comment Given a polygon of n-sides, why does the regular one (i.e. all sides equal) enclose the greatest area given a constant perimeter.
How did you prove it for quadrilaterals?
Jul
15
answered Number of ways of walking up stairs and Recurrence relation
Jul
15
comment $7^n-1$ is divisible by $6$ for all natural number $n$
Yes, this is clearly the most insightful way to do it. It is also a much broader technique.
Jul
14
answered $7^n-1$ is divisible by $6$ for all natural number $n$
Jul
14
revised Interview riddle
deleted 1 character in body
Jul
14
answered Interview riddle
Jul
13
comment Category Theory textbook (learning through guided discovery Dummit and Foote)
@WillJagy really? I would, if I found a place where I could learn it first.
Jul
13
asked Category Theory textbook (learning through guided discovery Dummit and Foote)
Jul
13
answered Best resource to learn quadratic reciprocity?
Jul
13
comment combinatorics for buying a new car
Did you try doing a tree graph depending on whether shee took the windows or not, then the sunroof or not, and then the leather or not=
Jul
13
answered Relationship between the probability two items in a list are correctly relatively ordered and the probability of any item being in the right place