Describe how and why the formula for permutations differs from the formula for combinations.

In permutations order matters, while in combinations it does not.

Step-by-step explanation:

Permutations are used to calculate the number of ways something or group of things whether for example cricket bats, computers, phones etc can be ordered but the condition that is very important is that the order is important. The function on the calculator is nPr. From n

Combinations are similarly calculated like the nPr but instead, the order of selection does not matter. nCr. From n choose r where it does not matter what the order goes like. No restrictions.

bull

step-by-step explanation:

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m