2025 MSHS PRELIMS P1 Q9

2025 MSHS PRELIMS P1 Q9

Secondary 4
5 marks

A bag contains 21 marbles, of which 6 are blue and 15 are red. Two marbles are drawn at random, one after the other, without replacement.

  1. Complete the tree diagram below.[2]
  2. Find the probability that
    1. both marbles drawn are blue,[1]
    2. at most one of the marbles drawn is red.[2]

Solution:

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Answer:(a) completed tree (b)(i) \(\frac1{14}\) (ii) \(\frac12\)

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