Probability

Probability

Secondary 4

A bag contains \(4\) red counters and \(3\) blue counters. Two counters are selected without replacement.

  1. Draw a fully labelled tree diagram.

  2. Find the probability that both counters are red.

  3. Find the probability that the counters have different colours.

  4. Find the probability that at least one counter is red.

Solution:

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Answer:(a) tree below; (b) \(\frac{2}{7}\); (c) \(\frac{4}{7}\); (d) \(\frac{6}{7}\).

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