school students decided to plant trees in and around the school reduce air pollution in the number of trees that is section of each class will be double of class studying in there are 12 12th class in the school and class two sections find how many trees were planted by the students which value shown in this question
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Explanation:
1st class students will plant 2
trees
ie. a=2
2nd class students will plant 4trees
ie. a2=4
d=a2 - a
=4 -2
=2
Sn=n/2(2a+(n-1)d)
S12=12/2(2×2+(12-1)2)
=6(4+11×2)
=6(4+22)
=6(26)
=156
thus total trees plant by the students are156
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