List the sample space of flipping a coin 3 times. How many elements of the sample space contain exactly two tails?
Responses
A 1
B 2
C 3
D 4
Sample space of flipping a coin 3 times: {HHH, HHT, HTH, HTT, THH, THT, TTH, TTT}
Number of elements of the sample space containing exactly two tails: 3
Answer: C. 3