Permutations or combinations? Permutations Answer: 3024
Practice makes perfect
We want to find how many ways there are to choose 4 out of 9 different reporters. Note that, in this case, the order is important. Therefore, each possible arrangement is a permutation. To calculate the answer, we will use the formula for permutations of n reporters taken r at a time.
_n P_r = n!/(n-r)!
We have 9 reporters and are taking 4 at a time. This means that n= 9 and r= 4. Let's substitute these values in the above formula.
