The AP formed by sequence i.e. number of plants by students is _It was decided that the number of trees that each section of each class will plant be the same as the
class in which they are studying, e.g. a section of class I will plant 1 tree, a section of class II will plant 2 trees and
so on section of class 12 will plant 12 trees.
Answers
Given : the number of trees, that each section of each class will plant, will be the same as the class in which they are studying, e.g., a section of Class I will plant 1 tree, a section of Class II will plant 2 trees and so on, till Class X
There are five sections of each class.
To Find : How many plants were needed for plantation by all sections of class IV?
(i) 20
(ii) 25
(iii) 30
(iv) 35
How many plants forest department to provide .
Solution:
There are five sections of each class.
a section of Class I will plant 1 tree,
5 sections of Class I will plant 5 x 1 = 5 tree,
a section of Class 2 will plant 2 tree,
5 sections of Class 2 will plant 5 x 2 = 10 tree,
5 sections of Class 4 will plant 5 x 4 = 20 tree,
20 is the correct answer
20 plants were needed for plantation by all sections of class IV
Total Plants required
= 5 ( 1 + 2 + 3 + + 9 + 10)
= 5 x 10 x 11/2
= 25 x 11
= 275
275 plants to be provided by forest department
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