Question

How many permutations exist of the letters a, b, c, d taken two at a time?

12
8
2

Answer 1

taking two at a time ?
you can take them like this right ?
ab, ba
ac, ca
ad, da

bc, cb
bd, db

cd, dc

total how many are they ?

Answer 2

6?

Answer 3

Easier way to do this is to calculate 4C2.

Answer 4

\( \color{Black}{\Rightarrow {4! \over (4 - 2)!} = {4 \times 3 \times 2 \over 2} }\)

Answer 5

Are you sure it isn't 4P2?
It was permutations after all...

Answer 6

i mean 12

Answer 7

it is 4p2. im trying to make him see what the question is asking for...

Answer 8

oops 4P2

Answer 9

@ParthKohli
I think what you gave was 4P2 after all
4C2 looks like
\[\frac{4!}{(4-2)!2!}\]

Answer 10

I said that wrong haha

Answer 11

Yeah I misspelt x{

Answer 12

im sooooooooo confused lol

Answer 13

That one crucial letter, eh? :)

Answer 14

something else was in my mind hehe

Answer 15

I answered a combinations question a while ago

Answer 16

hey @sdk, you want it to be explained thoroughly? I see that I'm drifting away from the main question, lol sorry