Question

in a school student thought of planting trees in around the school to reduce air pollution it was decided that the number of trees that is Section for IIT class will be planted will be the same as the class in which they are studying example section of class one will be planting 13 A section of class 2 will be planting two trees and so on till class 12 there are 3 sections of each class first how many trees will be planted by the student second which mathematical concept is used in above problem third which values is respected in this problem

Answer 1

a1 is no .pf trees planted by clasa1which is 3 because there are three sections.

similarly ,a2 is no of trees planted by class 2 which is 6 because there are 3 sections and each is planting 2 trees so 2×3=6

total classes are 12 so n=12 .,

first find an and then sn