X a1 a2 Y
X b1 b2 b3 Y
what is a2-a1 : b3-b1 in this AP? i was getting an answer of 2/3. don't know if it's correct.
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Your answer is correct.
$a_2 - a_1 = \frac{1}{3} (Y-X)$ and $b_3 - b_1 = \frac{1}{2} (Y-X) $.
Anon
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