Answer:
a. the probability of picking a navy sock and a black sock = P (A & B)
= (8/13
) * (5/12) = 40/156 = 0.256
b. the probability of picking two navy or two black is
= 56/156 + 20/156 = 76/156 = 0.487
c. the probability of either 2 navy socks is picked or one black & one navy socks.
= 40/156 + 56/156 = 96/156 = 0.615
Step-by-step explanation:
A sock drawer contains 8 navy blue socks and 5 black socks with no other socks.
If you reach in the drawer and take two socks without looking and without replacement, what is the probability that:
Solution:
total socks = N = 8 + 5 + 0 = 13
a) you will pick a navy sock and a black sock?
Let A be the probability of picking a navy socks first.
Then P (A) = 8/13
without replacing the navy sock, will pick the black sock, total number of socks left is 12.
Let B be the probability of picking a black sock again.
P (B) = 5/12.
Then, the probability of picking a navy sock and a black sock = P (A & B)
= (8/13
) * (5/12) = 40/156 = 0.256
b) the colors of the two socks will match?
Let A be the probability of picking a navy socks first.
Then P (A) = 8/13
without replacing the navy sock, will pick another navy sock, total number of socks left is 12.
Let B be the probability of another navy sock again.
P (B) = 7/12.
Then, the probability of picking 2 navy sock = P (A & B)
= (8/13
) * (7/12) = 56/156 = 0.359
Let D be the probability of picking a black socks first.
Then P (D) = 5/13
without replacing the black sock, will pick another black sock, total number of socks left is 12.
Let E be the probability of another black sock again.
P (E) = 4/12.
Then, the probability of picking 2 black sock = P (D & E)
= (5/13
) * (4/12) = 5/39 = 0.128
Now, the probability of picking two navy or two black is
= 56/156 + 20/156 = 76/156 = 0.487
c) at least one navy sock will be selected?
this means, is either you pick one navy sock and one black or two navy socks.
so, if you will pick a navy sock and a black sock, the probability of picking a navy sock and a black sock = P (A & B)
= (8/13
) * (5/12) = 40/156 = 0.256
also, if you will pick 2 navy sock, Then, the probability of picking 2 navy sock = P (A & B)
= (8/13
) * (7/12) = 56/156 = 0.359
now either 2 navy socks is picked or one black one navy socks.
= 40/156 + 56/156 = 96/156 = 0.615
, then 
to factorise the exponents:
