Let A be the set of factors of 20, B be the set of factors of 30, C be the set of factors of 40, and D be the set of factors of 50.
The universal set is {1, 2, 3, 4, 5, 6, 8, 10, 15, 20, 25, 30, 40, 50).
1.
Write sets A through D using set notation.

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