Since order is important...
12!/(12-3)!=1320
or if you prefer
12*11*10=1320
The answer is A.
But that is not the exact answer as 3.14 is not exactly equal to pi but that's the best we can do when theres a billion digits of pi
The correct answer according to me is 3=12
Answer:

Step-by-step explanation:
A sequence that has a common difference is an <em>arithmetic sequence</em>:

where aₙ is the nth term, n is the index, and d is the common difference.
In your question:
Plug those into the formula:

Then solve:

(3x+1) + (2x+8) = 180
5x+9=180
5x=171