In how many ways can $5$ rings of different types be worn on $4$ fingers?
38020
In how many ways $5$ different rings can be worn on $4$ fingers?
76405
Let n be an even integer. How many different ways can I choose subsets of the set {1,2...,n}
111473
Wear a hat multiple times?
65260
In how many ways can you select one of the two but not both?
97999
Explain these ring isomorphisms
50755
What would have been our number system if humans had more than 10 fingers? Try to solve this puzzle.
125214
Catalan numbers - number of ways to stack coins
112596
Stones in a bag with Combinations
131885
Show that not all 5 cycles in $A_5$ are conjugate in $A_5$
110009
Circular Rotation Of five buttons maintaining equal distance
120095
How many ways to split n elements in k groups?
128051
Calculating possible option of switching pairs in group
105193
$3$ and $5 $cent coins
59419
Crafty solutions to the following limit
14191
How many elements does the ring $ℤ[X]/(X^2-3,2X-4)$ have? Describe the structure of this ring.
11447
How many $4$ digit even numbers have all $4$ digits distinct?
108412
How can I create a Mobius ring?