a =  Initial population observed per month 
r =  Common ratio of geometric series 
n =  Number of terms of geometric series (Example number of months) 
L =  Last term number 
Sum =  Total Population 
Practice exercise:  
Assuming the cell growth ratio is 1.5 and it is growing in geometric progression, What is the total count of cells after 37 seconds. Answer: 1,310,498 
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Basic Arithmetic

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Related topic:
So what if I can't remember formula and forget how to use calculator?