Question

the students were planting saplings in the school field​

Answer 1

Answer:

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.

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Explanation:

Answer 2

Answer:

According to the question , there are two sections of each class so the number of trees that are planted by students of class I, class II, class III, …..& class XII are:

Number of trees planted by the students of two sections of class  I=2×2=4

Number of trees planted by the students of two sections of class II=2×4=8

Similarly,

Number of trees planted by the students of two sections of class 3=2×6=12

Number of trees planted by the students of two sections of class12=2×24=48

So, the number of trees planted by the students of two sections of different classes are4,8,12,……48

This series forms an AP

Here,first term(a)=4, common Difference (d)=8–4=4, last term (l)=48 and (number of terms)n=12

Number of trees planted by the students =sum of 12 terms of above AP

Sn= 2n[a+l],

Sn= [4+48],

Sn =6×52=312,

Hence, the total number of trees planted by the students is 312.