What should come in place of the '?' in the given series? 8 15 28 53 ? 199
102
Each term follows the pattern: next term = 2 × current term − n, where n increases by 1 each step.
\(15 = 2\times8-1\), \(28=2\times15-2\), \(53=2\times28-3\).
Next term: \(2\times53-4 = 102\). Checking forward: \(2\times102-5 = 199\), matching the given last term.
Hence, the missing term in the series is 102.
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