Craig’s drawer contains 6 white socks, 5 blue socks, and 7 black socks. He selects a sock without looking and does not replace it. Then he selects another sock without looking. Find P(two black socks). A-49/324
B-7/51
C-5/51
D-7/18

(b)

Step-by-step explanation:

Given

Craig's drawer contains 6 white, 5 blue and 7 black socks

He first select a sock without looking and then select another sock

Probability that he select the two black socks is equal to the product of selecting first black sock and second black sock.

Hence, option (b) is correct.

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.