Question

find the sum of all natural number from 1 and 100 which are divided by 2 or 5​

Answer 1

Answer:

numbers divided by 2 and 5=10,20,30,40,50,60,70,80,90,100

a=10

d=10

s10=10/2(10+90)

s10=500

Answer 2

sum of all the natural numbers from 1 and 100 which are divisible by 2 or 5

=2+4+6+8+10+12+14+16+18+20+22+24+26+28+30+32+34+36+38+40+42+44+46+48+50+52+54+56+58+60+62+64+66+68+70+72+74+76+78+80+82+84+86+88+90+92+94+96+98+100+5+15+25+35+45+55+65+75+85+95=2995

I hope this will help you