How many ways are there to pick r objects from n objects when each object appears an odd number of times?
21152
Exactly half of the elements of $\mathcal{P}(A)$ are odd-sized
96588
How to take the first N items from a generator or list?
128196
Conditional Gathering of lists
51724
Calculate Nth multiset combination (with repetition) based only on index
49014
Getting unique items from a list
26196
Picking a Random Object in an NSArray
105892
Selective and bunched entries to list of figures
2602
How do I create a weighted collection and then pick a random element from it?
13722
how to get all possible combination of items from 2-dimensional list in python?
148430
Choosing a random file from a directory (with a large number of files) in Python
98711
How to duplicate a certain collection using Python?
3136
Pick random element from array, but unique
156442
Remove multiple objects with rm()
119728
How to remove all duplicates from an array of objects?
10550
How to randomly select an item from a list?
60419
Randomly selecting elements without repetition
57137
Multichoosing (Stars and bars)