What will come in place of question mark (?) in the given number series ?
142 70 34 16 ? 2.5
Each number is divided by 2 and then 1 is subtracted
142 $$\div 2 - 1$$ = 70
70 $$\div 2 - 1$$ = 34
34 $$\div 2 - 1$$ = 16
16 $$\div 2 - 1$$ = 7
7 $$\div 2 - 1$$ = 2.5
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