Question

A school has 3 sections each from class 1 to 12. Students of this school plant tree in the school campus to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be the same as the class in which they are studying. How many plants were planted by the students?

A

234

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B

254

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C

182

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D

78

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Solution

The correct option is A 234 The number of trees planted by the students of class 1 to 12: 3,6,9,…,36 Clearly, it is an AP. Here, a=3,d=6−3=3 and an=l=36 Sn=n2(a+l) S12=122(3+36)=6×39=234 Therefore, 234 plants were planted by the students.

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