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The average of the 2nd and 3rd number equals the 1st number.
(91, 78, 104) → (78 + 104) / 2 = 91
(68, 55, 81) → (55 + 81)/2 = 68
Now, checking the options:
Option A → (85, 72, 98) → (72 + 98) / 2 = 85
Option B → (44, 30, 60) → (30 + 60)/2 = 45
Option C → (57, 41, 73) → (41 + 73)/2 = 57
Option D → (77, 64, 90) → (64 + 90)/2 = 77
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