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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 15, inclusive

\[A = \{1, 2, 7, 8, 9, 10, 11, 12\}\]
\[B = \{3, 4, 5, 6, 7, 8, 9, 10, 11, 12\}\]
(a)1 mark

Which event is known in \(\Pr(B\mid A)\)?

(b)1 mark

Use the listed outcomes to find \(\Pr(B\mid A)\)

Format: exact probability