The GATE Grind

GATE 2024 ME – Question 2

General Aptitude · Analytical Aptitude: Logical Reasoning and Deduction · 1 mark · Multiple choice

Find the odd one out in the set: {19, 37, 21, 17, 23, 29, 31, 11}

  1. 21
  2. 29
  3. 37
  4. 23

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (A) 21

Explanation

Apart from 21, every number in the set is prime: 19, 37, 17, 23, 29, 31 and 11. The number 21 is $3 \times 7$, so it is the odd one out.