What will come in place of the question mark (?) in each of the following number series.
158, 78, 38, 18, 8, ?
Each number is divided by 2 and then 1 is subtracted.
158 $$\div 2 - 1$$ = 78
78 $$\div 2 - 1$$ = 38
38 $$\div 2 - 1$$ = 18
18 $$\div 2 - 1$$ = 8
8 $$\div 2 - 1$$ = 3
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