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Conditional probability from exact representations

Question 1 of 8

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A collection of paper samples is classified by two features

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

Let A be the event that the paper is folded, and let B be the event that the paper has a square mark. The sample space is S

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

A = \{1, 2, 3, 4, 5, 6, 7, 8, 12, 13, 14, 15, 16, 17, 18\}

B = \{9, 10, 11, 12, 13, 14, 15, 16, 17, 18\}