Elizabeth brought a box of donuts to share. there are two-dozen (24) donuts in the box, all identical in size, shape, and color. three are jelly-filled, 8 are lemon-filled, and 13 are custard-filled. you randomly select one donut, eat it, and select another donut. find the probability of selecting two jelly-filled donuts in a row.

1/92

Step-by-step explanation:

There are C(3, 2) = 3 ways to select 2 jelly-filled donuts from the 3 in the box. There are C(24, 2) = 276 ways to select 2 donuts from the box.

The probability that you will select 2 jelly-filled donuts is ...

... 3/276 = 1/92

C(n, k) = n!/(k!(n-k)!)

C(3, 2) = (3·2)/2 = 3

C(24, 2) = (24·23)/2 = 276

if you are saying purchasing 3 social media ads and one newspaper ad counts as one purchase then there are:

6 purchases

if you are asking how many of each then:

18 social media ads

6 newspaper ads