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Probability, SM-Bank 060 MC

Benji randomly picks one disc from the group of white and coloured discs, pictured below.
 

 

 
What is the probability Benji chooses a white disc?

  1. \(\dfrac{2}{3}\)
  2. \(\dfrac{8}{13}\)
  3. \(\dfrac{8}{21}\)
  4. \(\dfrac{13}{21}\)
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\(D\)

Show Worked Solution
\(P\text{(White disc)}\) \(=\dfrac{\text{Number of white discs}}{\text{Total discs}}\)
  \(=\dfrac{13}{21}\)

\(\Rightarrow D\)