In a school, students decide to plant trees in and around the school 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 has two sections, find how many trees were planted by the students.

Each class has to plant double the class they are studying

Therefore, first class will plant = 2


Second class will plant = 4


Same as, 12th class will plant = 24


Total number of plants to be planted = sum of all plants


= [a + l]


= [2 + 24]


= 6 * 26 = 156


Therefore, there are 2 sections in each class


So, total trees = 2 * 156 = 312


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