Given that a, x1, X2 and B are equal difference sequence, a, Y1, Y2 and B are equal ratio sequence, find (x1 + x2) / (y1y2) Such as the title The answer is (a + b) / (AB)?

Yes. The arithmetic sequence is a-x1 = x2-b, X1 + x2 = a + B
The arithmetic sequence is a / Y1 = Y2 / B, y1y2 = ab
So what you did was right

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