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What will come in place of the question mark (?) in the following number series ?
The pattern is :
4 $$\times 2 - 1$$ = 7
7 $$\times 3 - 1$$ = 20
20 $$\times 4 - 1$$ = 79
79 $$\times 5 - 1$$ = 394
394 $$\times 6 - 1$$ = 2363
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