Question

Did all the three classes together meet the school,s planning of planting 1000 plants?​

Answer 1

Answer:

Answer

It can be observed that the number of trees planted by the students is in an AP.

1,2,3,4,5………………..12

First term, a=1

Common difference, d=2−1=1

Sn=2n[2a+(n−1)d]

S12=212[2(1)+(12−1)(1)]

=6(2+11)

=6(13)

=78

Therefore, number of trees planted by 1 section of the classes =78

Number of trees planted by 3 sections of the classes = 3×78=234

Therefore, 234 trees will be planted by the students.