Since $F$ is the subset of outcomes in which at least one die shows an odd number, we can list the elements as follows:
$F = \{(1,1), (1,2), (1,3), (1,4), (1,5), (1,6), (2,1), (3,1), (3,3), (3,4), (3,5), (3,6), (4,1), (5,1), (5,2), (5,3), (5,4), (5,5), (5,6),
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