Solution:100 या 100 से कम हरों वाली सभी उचित भिन्नों का योगफल= 1/2 + (1/3 + 2/3) + (1/4 + 2/4 + 3/4) + ... + (1/100 + 2/100 + 3/100 + ... + 99/100)
= 1/2 + (3/3) + (6/4) + ... + [99 x (99 + 1)/2] × 1/100
= 1/2 + 1 + 3/2 + ... + 99/2
= 1/2 [1 + 2 + 3 + ... + 99]
= 1/2 [99 × (99 + 1)/2]
= (99 × 100) / (2 × 2)
= 99 × 25
= 2475
[1 + 2 + ... + n = n(n + 1)/2]