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What will come in place of the question mark (?) in the given number series ?
The pattern followed is :
3 $$\times 1 + 2$$ = 5
5 $$\times 2 + 3$$ = 13
13 $$\times 3 + 4$$ = 43
43 $$\times 4 + 5$$ = 177
177 $$\times 5 + 6$$ = 891
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