Answer :

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

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

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

Now, there are 2 sections, ∴ Number of trees planted by class 2^{nd} = 8

This will follow up to class 12^{th} 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, S_{12} = (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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