Hari (H), Gita (G), Irfan (I) and Saira (S) are siblings (i.e. brothers and sisters). All were born on 1^st january. The age difference between any two successive siblings (that is born one after another) is less than 3 years. Given the following facts: i. Hari's age + Gita's age > Irfan's age + Saira's age ii. The age difference between Gita and Saira is 1 year. However Gita is not the oldest and Saira is not the youngest. iii. There are no twins.

In what order were they born (oldest first)?

Let S, G, H, I be ages. From (ii): S-G=1 year, S not oldest, I not youngest. From (iii): all ages different. From (i): H+G > I+S. If S > G (S older by 1): Try order SGHI. Ages: S > G > H > I. Then H+G > I+S becomes H+G > I+S, which holds if G-I > S-H, or 1 > S-H, meaning S-H < 1, impossible since no twins. So G > S (G older by 1). Try SGHI: S > G > H > I won't work. Try SGHI with G > S: ages G > S > H > I gives H+S > I+G, but we need H+G > I+S. This means G-S > I-H, or 1 > I-H, meaning I-H < 1, impossible. Let me reconsider: the order SGHI with G > S > H > I satisfies: age difference G-S < 3, S-H < 3, H-I < 3, G-S = 1, S not oldest, I not youngest, H+G > I+S.