The population of a local species of dragonfly can be found using an infinite geometric series where a1 = 30 and the common ratio is 2/5. write the sum in sigma notation and calculate the sum that will be the upper limit of this population.

50 is the answer.

Step-by-step explanation:

We have, and common ratio d=2/5.

So, the general form of the geometric series is , for 'n' is from 1 to infinity.

Hence, the sum in sigma form = , where n goes from 1 to infinity.

Now, the infinite sum of geometric series =

i.e. = 50

Hence, the sum which will be the upper limit is 50

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