Probability

Probability

Secondary 4

Twenty identical cards are numbered \(1\) to \(20\). One card is selected at random.
Find the probability that its number is:

  1. prime;

  2. not a multiple of \(3\);

  3. greater than \(20\);

  4. at most \(20\).

Solution:

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Answer:(a) \(\frac25\); (b) \(\frac7{10}\); (c) \(0\); (d) \(1\)

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