All socks together: 13
Black socks: 3
Probability to pick out black socks: 3/13
After one pick out (You picked out a pair of black socks):
Probability to pick out black socks: 2/12
Multiply them:
2/12 * 3/13 = 1/26 ≈ 0,038
Answer: 72 miles
Step-by-step explanation:
I believe the answer is 55.49 inches
using the equation C^2/(4*3.14)