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GATE 2020 CS – Question 7

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

If P = 3, R = 27, T = 243, then Q + S = ______.

  1. 40
  2. 80
  3. 90
  4. 110

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Show answer and explanation

Correct answer: (C) 90

Explanation

The letters follow powers of 3 by alphabet position: P=3^1, Q=3^2=9, R=3^3=27, S=3^4=81, T=3^5=243. So Q+S = 9+81 = 90.