Number of ways books may be chosen if a particular must be chosen by at least $20$ students? at most $20$ students?
73623
In how many ways can $500$ indistinguishable students select books from $10$ titles if no more than $20$ copies of one particular text are selected?
69788
Probability of Hearts given Hearts Was Chosen
103554
Is it ethical to profit by having my students buy my textbook?
150726
determine the least number of rounds that needs to be played so that every child is satisfied
109262
probability that he will be selected in one of the firms
95939
Combinations of 6 students among 20, at least one male
41365
Choice function for collection of arbitrary finite sets. AC required?
107688
A contest question on probability
16769
What is the probability of drawing a four of a kind when 20 cards are drawn from a deck of 52?
12926
number of ways to make $2.00
79978
What are the limits of the Room of Requirement?
55706
Algorithm with chapter number
59607
Limit of probability question
140858
Number of ways to choose 6 objects when they are of 11 different kinds
13260
Choosing $101$ numbers from $\{1, 2, \dots , 200\}$.
59419
Crafty solutions to the following limit
145102
Selecting A combination of minimum cost