A box contain 3 blue balls, 7 red balls and 8 white balls. If three balls are drawn at random from the box, what is the probability that: (a) two are red and one is blue? (b) at least two are white? (c) one of each colour is drawn?

step-by-step explanation:

first, you divide the triangle in two, tô form a retangle triangle. after, using pythagoream theorem:

18^2 = 14^2 + (x/2)^2

(x^2/4) + 196 = 324

x^2/4 = 324 - 196

x^2/4 = 128

x^2 = 512

x = √512

x = √2^9

x = 16√2 cm

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