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On the occasion of the world environment day 5th June there is plantation in the School campus. All the students with counsel of students and teachers decided to plant trees in and around the school building to reduce air pollution. It was decided that the number of trees, that each section of each class will plant will be double of the class in which they are studying. If there are 1 to 12 classes in the school and each class have 2 sections. (i) Form an AP representing number of trees planted by each class. (ii) Find total number of trees planted by students.
Asked by rachappamattikatti | 04 Apr, 2022, 08:42: PM

i) Solution —

class 1 had planted = [(1+1)2] = 4

Class 2 had planted = [(2+2)2] = 8

Class 3 had planted = [(3+3)2] = 12

.............

Class 12 had planted = [(12+12)2] = 48

Therefore, AP= 4, 8, 12,.......48

ii) Solution —

Given,

a = 4

l = 48

n = 12

Sn = ?

We know that,

sn = n/2(a+l)

=12/2(4+48)

= 6×52

=312

Therefore,

Total number of trees planted by School is = 312

THANK YOU! —

Answered by Renu Varma | 11 Apr, 2022, 09:45: AM

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