What should come in place of the '?' in the given series? 3 ? 90 360 1080 2160 2160
18
Ratios between consecutive terms: \(90\to360\) is ×4, \(360\to1080\) is ×3, \(1080\to2160\) is ×2, \(2160\to2160\) is ×1 — a decreasing multiplier pattern (4,3,2,1).
Extending backward, the multiplier before ×4 should be ×5, giving \(? = 90\div5 = 18\).
Checking consistency: \(3\times6=18\) also fits the extended pattern (6,5,4,3,2,1).
Hence, the missing term in the series is 18.
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