Answer:
Step-by-step explanation:
Given that a fair coin is flipped twelve times.
It means the number of possible sequences of heads and tails would be:
2¹² = 4096
We can determine the number of ways that such a sequence could contain exactly 9 tails is the number of ways of choosing 9 out of 12, using the formula

Plug in n = 12 and r = 9


∵ 
∵ 

Thus, the probability will be:



Thus, the probability of the coin landing tails up exactly nine times will be:
Answer:
b
Step-by-step explanation:
because we can not some times change the places in addition so b is the correct answer
Use Socratic it will give you the right answers
Answer:
(3, 6)
yw
Step-by-step explanation: