In a school, it was decided that the no. of trees that each section of each class will plant, will be double of the class in which they r studying. If
there are 1 to 12 classes in the school and each class has 2 sections, find how many trees were planted by the students.
please friends solve it n tell me the answer..!.....my answer is 312 but i'm not sure about it..!!
HELP ME OUT..!!