Solution
In the Given series 12, 25, 52, 107, 218, ?
We can observe the pattern $$ 12, 12 \times 2 +1 $$, $$ 25 \times 2 +2 $$, $$ 52 \times 2 + 3 $$ , $$ 107 \times 2 +4 $$,
Similarly, next term would be $$ 218 \times 2 + 5 $$ = 441
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