Question

In a school student thought of planting trees in and around the school to reduce the air pollution. it was decided that a number of trees, that each section of each class will plant, will be the same as the class, in which they are studying, e.g., a section of class one will plant one tree a section of class 2 will plant to trees and so on till class 12. there are three section of each class. how many trees will be planted by the students?

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Answer 1

Answer:

trees planted by the students is in an AP.

1,2,3,4,5………………..12

First term, a=1

Common difference, d=2−1=1

Sn = n/2[ 2a + (n-1)d]

S¹² = 12/2 [ 2(1) + (12-1)(1) ]

= 6 (2+11)

=6 × 13

= 78

Therefore, number of trees planted by 1 section of the classes =78

Number of trees planted by 3 sections of the classes = 3×78=234

Therefore, 234 trees will be planted by the students.

Explanation:

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