Is there a generalized solution to the birthday problem?
79493
Probability of 3 people in a room of 30 having the same birthday
121920
Can there be multiple paths for which Fermat's least time principle can be obeyed?
56528
On the proof of existence and uniqueness of radix representation
153692
Generating and solving recurrence relations
12291
Two envelope problem revisited
134440
An unexpected application of non-trivial combinatorics
47240
An alternate solution to the hat-matching problem, probability of exactly $k$ matches
94295
Pigeonhole-principle with two choices
65335
A "binomial" generalization of harmonic numbers
70439
Mapping two integers to one, in a unique and deterministic way
55199
Number Theory in a Choice-less World
71222
probability question ("birthday paradox")
53960
birthday problem - expected number of collisions
158179
Birthday problem: why is this solution wrong?
86067
A Variation of the even-town odd-town problem
33851
Generalizing a sequence.
66524
The Impossibility ( or Possibility) of Solving $N$-Body Problem