Algebraic identity arising from coupon collectors problem.
14399
Calculate $\sum_{k=1}^n (-1)^{k+1} \binom{n}{k}\frac{1}{k}$
110062
Coupon Collector Prob Variation
108688
An identity involving products of sums
69748
Semi-Ambiguous Combinatorics Problem
139499
The algebraic closure of a finite field and its Galois group
81879
$Av=λv$ basis proof problems
74777
Solvability and reducibility of a polynomial in a "chain" of finite fields
31076
Roots of unity filter, identity involving $\sum_{k \ge 0} \binom{n}{3k}$
62484
Proving Hartshorne's Exercise I-1.9 by using exercise I-1.8
158405
Explanation of Freeman Dyson's solution of the counterfeit coin problem
140190
Binary operation $xy$, has identity, but not associativity. Is the inverse unique?
54990
Coupon collector's problem: mean and variance in number of coupons to be collected to complete a set (unequal probabilities)
146347
An imo shortlist algebra question
105385
Using Recursion to Solve Coupon Collector
114011
Algebra - Solving for three unknowns.
87320
Proving identities like $\sum_{k=1}^nk{n\choose k}^2=n{2n-1\choose n}$ combinatorially
28109
Conjectural closed-form representations of sums, products or integrals