Which of the following situations represents choosing a random sample?

a. assign each person of the population a number. put all the
numbers into a bowl and choose ten numbers.

b. make a list of everyone in the population and put their
names in alphabetical order. choose every twelfth name.

c. make a list of everyone in the population and put their names in order of age. choose the ten youngest and ten oldest people.

, and

for

step-by-step explanation:

we can analyze the pattern at which the terms increase. let us denote , , , so that we can call

note the following:

the pattern: to get the next term value, we just add the next term number (e.g. 1st, 2nd, to the previous term value (term values are the given numbers in the question, 1, 3, 6, 10, 15,

from , to get to , we add

from , to get to , we add

etc.

we need to form a recursive formula, a formula that has the next term as a function of the previous term. so a possible recursive formula can be

, and for

lol.

it's ok we all do this sometimes.

-aparri

the answer is d

step-by-step explanation:

you can also use mathway to get you answer + steps