Find the number of ways to select ten distinct letters from the alphabet {􏰘A, B, C, . . . , Z}􏰙 if no two consecutive letters can be selected.
826
What is the number of ways to select ten distinct letters from the alphabet $\{a, b, c, \ldots, z\}$, if no two consecutive letters can be selected?
113242
How many ways can you create a password of 10 characters long that has at least one lowercase letter (a-z) and at least one number ($0-9$)?
107027
Number of combinations and permutations of letters
1405
Arrangements of a,a,a,b,b,b,c,c,c in which no three consecutive letters are the same
158580
Permutation count of AABBC
125451
What is the solution to the Squirrel sequence of letters question?
32508
how many ways can the letters in ARRANGEMENT can be arranged
20987
Find the number of 3 letter words that can be formed from the word 'SERIES'.
37051
Choosing numbers without consecutive numbers.
25283
Intermediate Text in Combinatorics?
25590
Find a recurrence relation for the number of ternary strings of length n that do not contain two consecutive 0s or two consecutive 1s.
86480
Is the set of all finite sequences of letters of Latin alphabet countable/uncountable? How to prove either?
62371
Expected number of times a set of 10 integers (selected from 1-100) is selected before all 100 are seen
95355
How many distinct ways to climb stairs in 1 or 2 steps at a time? (Fibonacci puzzle)
77547
Find integers $a,b,c,d$ such that
108941
Combinatorics Question Asking How Many Integer Solutions Given Different Restrictions
40763
Possible orders of permutations of $11$ symbols