an urn contains 3 blue chips and 7 red chips. sequentially draw 3 chips without replacement. what is the probability that all drawn chips will not be the same color?

Answer 1

there are 10C3 ways of drawing 3 chips

there are 7C3 ways of drawing 3 red chips

there is one way to draw 3 blue chips

p = 1 - [(7C3 + 1) / 10C3]