We have a virus that lives one hour. Every half hour produce two child viruses. What will be the living population of the virus after 3.5 hours?

Correct result:

x =  1224


0.0h @ n=1 0.5h @ n=1+20=3 1.0h @ n=3+61=8 1.5h @ n=8+162=22 2.0h @ n=22+446=60 2.5h @ n=60+12016=164 3.0h @ n=164+32844=448 3.5h @ n=448+896120=1224 x=1224

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