Question

permutations: how many different groups of four letters can be made from the letters A-F (6 letters) if letters can only be used once?

Answer 1

P(6,6) = 6! / (6 - 6)! = 720

Answer 2

6 choices for first letter, 5 for the next, 4 for the next then 3...
6*5*4*3

Answer 3

@Rohangrr it should be 6P4 not 6P6 - making a four letter group only.

Answer 4

@agent0smith i think here the order is not important

Answer 5

@julian25 the word permutations is the first word of the question :P

But i wondered that too, when it just said "groups"

Answer 6

yes it is a combination
the problem ask form groups so it is the same abcd than bacd

Answer 7

@julian25

permutations: how many different groups of four letters can be made from the letters A-F (6 letters) if letters can only be used once?

The word permutations seems like a massive hint here...

Answer 8

i dont know what to answer when u tell me about hints and not about analize deeply the problem

Answer 9

the last alternative is look at the choices answer :)

Answer 10

@soapia is too mch quiet in the contro.

Answer 11

It doesn't get much more obvious than having the word permutation at the front of the question. Remove the word permutations, and it may become a combinations problem. As is, there should be no debate over whether this question is permutations or not.

Answer 12

The reason it says groups is because they are not words - ABCE etc are not words, they're just groups of letters, and if order did not matter, then the question would not be labelled permutations.