Question

find the sum of odd integers from 1 to 2001​

Answer 1

No. of terms: (tn_ti)/d x100

= ( 2001-I)/2 +l=IOOI

sum=n/2[2a+(n-l)d

= lOOI/2[2xl+(lool

-- I) 2 ] = IOOIXIOOl=1002001

OR

n2 = 100 Ixl001 = 1002001

Answer 10, 02001