GATE 2010 CS (CS1) – Question 7

General Aptitude · Analytical Aptitude: Logical Reasoning, Deduction and Analogy · 2 marks · Multiple choice

Hari, Gita, Irfan and Saira are siblings, all born on January 1 in different years. Each successive age gap is less than three years. Hari and Gita together are older than Irfan and Saira together. Gita and Saira differ by one year. Gita is not oldest and Saira is not youngest. Choose their order from oldest to youngest.

Hari,Saira,Irfan,Gita
Saira,Gita,Hari,Irfan
Irfan,Gita,Saira,Hari
Irfan,Hari,Saira,Gita

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Show answer and explanation

Correct answer: (B) Saira,Gita,Hari,Irfan

Explanation

Gita and Saira must be adjacent because their ages differ by one year and no birthdays coincide. This eliminates A. In C and D, the ordering and gaps make Irfan plus Saira older than Hari plus Gita, violating the stated sum. B is feasible, for example ages Saira four, Gita three, Hari two, Irfan zero. Then 3+2>0+4. Thus B.

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