Three-colour marble probabilities

Three-colour marble probabilities

Secondary 2
2 marks
TGM Original Questions

A bag contains 40 blue, yellow and green marbles in total. The probabilities of drawing blue and yellow are \(\frac{3}{8}\) and \(\frac{7}{20}\), respectively. One marble is selected at random. Find

  1. the number of yellow marbles,[1]
  2. the probability of drawing green.[1]

Solution:

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Answer:(a) \(14\) (b) \(\frac{11}{40}\).

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