Answer :

Number of trees planted by one section of class 1st = 2

Now, there are 2 sections, Number of trees planted by class 1st = 4


Number of trees planted by one section of class 2nd = 4


Now, there are 2 sections, Number of trees planted by class 2nd = 8


This will follow up to class 12th and we will obtain an AP as


4, 8, 12, … upto 12 terms.


Now, Total number of trees planted by the students = 4 + 8 + 12 + … upto 12 terms.


In this Arithmetic series, first term = a = 4


Common difference = d = 4


Now, S12 = (12/2)[2a + (12 - 1)d]


= 6[2(4) + 11(4)]


= 6 × [8 + 44]


= 6 × 52


= 312


Total number of trees planted by the students = 312


Values shown in the question are care and awareness about conservation of nature and environment.


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