No, there are 1000 of them and I have better things to do with my life!
There is only one possible combination as a combination is the same no matter what the order is. There are 120 permutations, which is where the order does matter.
1260.
4! Four factorial. 4 * 3 * 2 = 24 permutations ------------------------
Since there are no duplicate letters in the word RAINBOW, the number of permutations of those letters is simply the number of permutations of 7 things taken 7 at a time, i.e. 7 factorial, which is 5040.
There are 720 possible permutations.
There is only one possible combination as a combination is the same no matter what the order is. There are 120 permutations, which is where the order does matter.
39916800 permutations are possible for the word INFORMATION.
There are 6! = 720 permutations.
120.
1260.
4! Four factorial. 4 * 3 * 2 = 24 permutations ------------------------
Normally, there would be 5!=120 different permutations* of five letters. Since two of the letters are the same, we can each of these permutations will be duplicated once (with the matching letters switched). So there are only half as many, or 60 permutations.* (the correct terminology is "permutation". "combination" means something else.)
120?
Since there are no duplicate letters in the word RAINBOW, the number of permutations of those letters is simply the number of permutations of 7 things taken 7 at a time, i.e. 7 factorial, which is 5040.
Only 2: CD and DC.
There are 720 of them.
There are 720 possible permutations.