Question

from
Ito
3 Find the sum of Natural numbers from 1 to 200
Excluding dose
divisible, by
5.
dose​

Answer 1

Answer:

I guess you know how to find the sum of numbers. Think of this as two series.

1,2,3,4 ......200   you can calculate the sum of this

200/2 * (1+200) = 20100

The next series is

5,10,15 ....  200   (all the numbers divisible by 5) the sum of this is

40/2 * (200+5) = 4100

So the required total = 20100-4100 = 16000