Significant amount of foreign coins from 6 different countries
80831
How do I get money back for my foreign coins?
14152
Are international transfer zones typical around the world?
84972
Expected number of rolls to get all sixes
140858
Number of ways to choose 6 objects when they are of 11 different kinds
7730
Changing unusual foreign currencies in London
82834
What are the different currencies and how are they earned?
130040
Rolling count of total transactions over time
125214
Catalan numbers - number of ways to stack coins
115552
Check whether a coin is fair
58783
Money from my parents from abroad to my bank account in UK
106160
Infinite amount of flags
77216
Of Countries and their Cities
29543
What's the name of this quantity?
124011
You observe k heads out of n tosses. Is the coin fair?
29238
Making Change for a Dollar (and other number partitioning problems)
10834
Using THE before some countries
116647
The number of different ways to choose $k$ out of $n$ unique items