Doubling

The message is spreading that each day has doubled the number of people who know about it. All know message for 20 days. How long known it eighth people?

Result

t8 =  17 d

Solution:

t2=19 t4=18 t8=17 dt_{2}=19 \ \\ t_{4}=18 \ \\ t_{8}=17 \ \text{d}



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