Probability is the ratio of: the number of observations of an event n(A) compared to the total number of observation n(S). Generally it could be written as P(A) =
Use combination to solve this problem The event being observed n(A) in this problem is 2 engineers being selected from 4 engineers. The observation n(S) is about 2 people being selected from 10 people (engineers + pilots).
n(A) could be determined using combination of 2 engineers from 4 engineers n(A) = n(A) = n(A) = n(A) = n(A) = n(A) = 6
n(S) could be determined using combination of 2 people from 10 people n(S) = n(S) = n(S) = n(S) = n(S) = n(S) = n(S) = 45