Question

Date
Page
4.) find sum of odd number betwen 1 to 200​

Answer 1

Answer:

odd numbers are

1,3,5,7,9

last term is 199 means Tn=199

by using formula

Tn=a+(n-1)d

199=1+(n-1) 2

199+1=(n-1)2

200=(n-1)2

200/2=(n-1)

n=101

Sn=101

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

S101= 101/2(2+200)

=101 multiply 100=

10500