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Conditional probability from exact representations

Question 1 of 8

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A collection of counters is classified by colour and shape

One of the listed outcomes or recorded items is selected uniformly at random

Let A be the event that the counter is blue, and let B be the event that the counter is round. The sample space is S

The sample space S contains the whole-number labels 1 to 21, inclusive

A = \{1, 2, 3, 12, 13, 14, 15, 16, 17, 18, 19\}

B = \{4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19\}