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Probability

Probability

IP 4

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

  1. prime;

  2. a perfect square;

  3. not a multiple of 3.

Solution:

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Answer:(a) \(\frac25;\) (b) \(\frac15;\) (c) \(\frac7{10}\).

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