Question

find the sum of the frist 200 natural nos

Answer 1

Answer:

formula Sn=n/2[2a+(n-1)d]

rnwhere n=200,a=1 and d=1(because it is from 1 to 200 so a=1 and n=200 and d is common difference)

rnSn=200/2[2*1+(200-1)*1]

rnSn=100[2+199]

rnSn=20100