If two lines AB and CD intersect at O such that ∠AOC = 5 ∠AOD, then the four angles at O are

1
40°, 40°, 140°, 140°
2
30°, 30°, 150°, 150°
3
30°, 45°, 75°, 210°
4
60°, 60°, 120°, 120°

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