Odd Man out Questions 27, 64, 343, 544, 1331

Explanation:

• 27 = 3^3 (perfect cube)

• 64 = 4^3 (perfect cube)

• 343 = 7^3 (perfect cube)

• 1331 = 11^3 (perfect cube)

• 544 is not a perfect cube: 8^3 = 512 and 9^3 = 729, so 544 falls between these and is not an integer cube

Conclusion: 544 is the odd one out because it is the only number that is not a perfect cube.