C ( 16, 2) combination

9514 1404 393

  120

Step-by-step explanation:

The function C(n, k) can be written in terms of factorials:

  C(n, k) = n!/(k!(n -k)!)

Then ...

  C(16, 2) = 16!//(2!(16 -2)!) = (16·15)/(2·1)

  C(16, 2) = 120

point a is the center of the circle that passes through points e, f, and g and the center of the circle that passes through points x, y, and z.