Question

Find the number of combinations of the letters a, b, c, and taken 3 at a time

Answer 1

abc
acb
bac
bca
cab
cba

Answer 2

Find the number of combinations of the letters a, b, c, and taken 3 at a time
-------
There is only ONE combination of the letters a, b, and c taken 3 at the time.
That is {a, b, c,} In a combination, order of letters is of no importance.

Answer 3

abc
acb
bac
bca
cab
cba

is the permutations of {a, b, c} taken 3 at the time.

Answer 4

My conjecture is that a letter is missing from the question:

"Find the number of combinations of the letters a, b, c, and ___something missing here---- taken 3 at a time"

Answer 5

He's right, I was thinking of permutations