What will come in place of the question mark (?) in the following number series?
8, 7, 12, 33, 128, ?
The pattern followed is :
8 $$\times 1 - 1$$ = 7
7 $$\times 2 - 2$$ = 12
12 $$\times 3 - 3$$ = 33
33 $$\times 4 - 4$$ = 128
128 $$\times 5 - 5$$ = 635
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