Question

find the sum of all natural numbers upto 70 and which are neither divisible by 3 nor by 4 using AP​

Answer 1

Answer:

The Natural Numbers between 1 ana 201 which are divisible by 5 are shown below

5,10,15,20.....................200

It forms AP with a =5, d=5 and I= 200

using the formula,

therefore, the sum is given by

thus, the required sum is 4100

HOPE IT HELPS YOU.

Answer 2

Answer:

$\huge\underbrace\mathfrak\pink{Answer}$

The natural numbers between 1 and 201 which are divisible by 5 are given below:

5 , 10 ,15 ,20..........200

it forms an AP with

a=5

d=5

I=200

using the formula,

therefore the sum is given by

thus the required sum is 4100.

.

I hope this helps you.......