What will come in the place of question mark (?) in the following number series ?
Each number is divided by 2 and then 1 is subtracted.
48 $$\times \frac{1}{2} - 1$$ = 23
23 $$\times \frac{1}{2} - 1$$ = 10.5
10.5 $$\times \frac{1}{2} - 1$$ = 4.25
4.25 $$\times \frac{1}{2} - 1$$ = 1.125
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