What should come in place of the '?' in the given series? 6 15 29 54 84 125 ?
171
First differences: \(9,\ 14,\ 25,\ 30,\ 41\). Second differences (differences of differences): \(5,\ 11,\ 5,\ 11\), alternating consistently.
The next second-difference should be 5, giving the next first-difference as \(41+5=46\).
Next term: \(125+46 = 171\).
Hence, the missing term in the series is 171.
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