What is the simplest formula I can use to randomly choose a value in column A that is associated with a given B value. So in the table below, I'm looking to randomly choose an A where B = 3. So I'm randomly choosing between row 1 (5.4) and row 3 (4.2). Note that this table can be arbitrarily large.
A B
1 5.4 3
2 2.3 1
3 4.2 3
4 9.2 2
... ...
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