Question

2. Complete the following activity to find the
sum of natural numbers between 1 to 75
The numbers between 1 to 75 divisible by 3
1 and 145
which are divisible by 3.
(3 marks)
Solution
7
3.6.
72
How many are these numbers ?n= ?
a=3,d= . t - 72
1. =a + (n-1)d
=2+(n-1) /
n-05-21-61 – 194
3.. 23​

Answer 1

Answer:

numbers between 1 and 145 which are divisible by 4.

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ANSWER

All natural numbers bwetween 1 and 145 which are divisible by 4 are,

4,8,12,16,...........,144 forms an A.P

with a=4 and d=4

Let, t

n

=144

⟹a+(n−1)d=144

⟹4+(n−1)4=144

⟹4(n−1)=140

⟹n−1=35

∴n=36

Now, S

n

=

2

n

[a+l]

=

2

36

[4+144]

=18×148

=2664