Find the sum of all odd numbers between 100 and 200
the given sequence is 101, 103, ….199
Given an AP whose first term a is 101, and common difference d is 2
To find: the sum of all odd numbers between 100 and 200
Hence the sum is given by the formula
Substituting the values in the above equation we get
Now for the finding number of terms, the formula is
Substituting n is the sum formula we get
s = 25 × 300
s = 7500