Answer to Q80
[9, 25, 49, x] [7, 10, 15, 8, 7]. What is x?
Let's rewrite the series as [A, B, C, D] [E, F, G, H, I]
(F - E)² = A : (10 - 7)² = 9
(G - F)² = B : (15 - 10)² = 25
(H - G)² = C : (8 - 15)² = 49
(I - H)² = D : (7 - 8)² = 1
Answer: 1
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