What number does the ? mark equal
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1 Answer

40, 50, 76, 104.

If we look at these numbers as angles and take them in pairs considering quadrants, the smaller of the first pair is the complement of the larger: 40=90-50. These angles complete the first quadrant.

In the second pair we consider the second quadrant: 90-180. The smaller of this pair is the supplement of the larger: 76=180-104. These angles complete the second quadrant.

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