1 + 3 + 5 + …. 449 Here a = 1, d = 3 – 1 = 2, l = 449 Aliter: Sum of all the positive odd intergers = n2 = 225 × 225 = 50625 Sum of the odd integers less than 450 = 50625Read more on Sarthaks.com - https://www.sarthaks.com/935800/find-the-sum-of-ail-odd-positive-integers-less-than-450