We'll find the answer by multiply "6 choose 3" by "10 choose 2". Let the number of ways we can choose be w.
w = C(6, 3) * C(10, 2)
We can use this formula to solve the combinations.
[tex]C(n, r) = \frac{n!}{r!(n-r)!} [/tex]
w = 20 * 45
w = 900
So there are 900 ways to create a group of people to go to the conference.