Probability

Probability

Secondary 4

A box contains \(5\) working pens and \(3\) faulty pens. Three pens are selected without replacement.

  1. Find the probability that none is faulty.

  2. Find the probability that exactly one is faulty. List all relevant orders.

  3. Find the probability that at least one is faulty.

Solution:

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Answer:(a) \(\frac{5}{28}\); (b) \(\frac{15}{28}\); (c) \(\frac{23}{28}\).

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