number of ways to get desired outcome
P(desired outcome) = ------------------------------------------
number of ways to choose 3 of the 14 chips
In every case the denominator of the fraction is
a. the chips are all different colors
We need to choose 1 of the 6 red AND 1 of the 5 blue AND 1 of the 3 white:
P(all different colors) = 90/364
b. the chips are all red
We need to choose 3 of the 6 red AND 0 of the 5 blue AND 0 of the 3 white:
P(all 3 red) = 20/364
c. 2 of the 3 are blue
We need to choose 2 of the 5 blue and 1 of the 9 red or white:
P(2 blue) = 90/364
Simplify the fractions, or convert to decimals, if required....