Question

i) Complete the following activity to find the sum of natural
numbers between 1L 40 which are divisible by 4. The
numbers between 1 and 140 divisible by 4 are 4,8,12,......136.
​

Answer 1

Answer:

2380

Step-by-step explanation:

from 1 to 140 natural numbers divisible by 4 are 4,8...136.

a=4

d=4

now,

tn=a+(n-1)4

=136=4+4n-4

=4n=136

n=34

thus,number of terms(n)=34

we know that

sn=n/2(2a+(n-1)d)

s34=34/2(2(4)+(34-1)(4))

=17(8+132)

=17(140)

=2380