Suppose a population of 50 crickets doubles in size every 4 months. how many crickets will there be after 5 years?

How many times will 4 months pass by in a total of 5 years ?

Well, 5 years = 60 months, so 4 months will pass  (60/4) = 15 times.

A number that doubles every 4 months will become  2¹⁵  times as large
during that period of time.

                                (50 crickets) · (2¹⁵)

                         =    (50 crickets) · (32,768)

                         =        1,638,400 crickets.

                                   They should all only
                                   live long and prosper. 

The answer would be: b