A drawer contains 4 white socks, 5 black socks, and 3 brown socks. Find the probability that ...

... a black sock is selected when a person chooses 1 sock

... a white or brown sock is selected when a person chooses 1 sock.

... a person chooses 3 socks and selects a white first, a black second, and a brown last if the socks are ...

... replaced to the drawer.

ii ... NOT replaced to the drawer.

5/12

7/12

125/36 = 3,47%

50/11 = 4,54%

Step-by-step explanation:

Probability a black sock is selected when a person chooses 1 sock = 5/12

Probability a white or brown sock is selected when a person chooses 1 sock =

7/12

Probability a person chooses 3 socks and selects a white first, a black second, and a brown last if the socks are replace = (4/12 * 5/12 * 3/12) * 100 = 125/36 = 3,47%

Pobability a person chooses 3 socks and selects a white first, a black second, and a brown last if the socks are NOT replace = (4/12 * 5/11 * 3 / 10) * 100 = 50/11 = 4,54%