Which question below is a permutation?

a how many different teams of four runners can a coach choose from a group of seven runners?

b you and three friends want to line up next to one another for a picture. how many ways can the picture be taken?

c you want to choose three pairs of shorts from five to go on vacation. how many groups of three pairs of shorts can you choose?

d how many groups of five movies can be chosen from 11?

You and three friends want to line up next to one another for a picture. How many ways can the picture be taken?

Step-by-step explanation:

B is a permutation because A, C, and D all ask for different groups, which means that they are combinations.

  n=   0.0000 - 0.3750 i  

  n=   0.0000 + 0.3750 i

step-by-step explanation:

one of these should be correct

d. millimeters per hour.

step-by-step explanation:

we are given that,

carlo used a rain gauge to measure the amount of water his lawn is receiving from the sprinklers.

since, according to the options, we see that,

water cannot be measured by 'miles per hour', 'meters per second' and 'grams per seconds'.

we get that, the water can be measured by 'millimeters per hour'.

hence, the appropriate rate for describing the amount of water is 'millimeters per hour'.