Find the odd number / letters / word from the given alternative:

by

Jul-84
6 - 108
May-75
Mar-99

The answer is D. 3 – 99.

In each of the other options, the first number is one less than the square of the second

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number.
  • 7 – 84: 7^2 = 49, 84 = 49 + 35
  • 6 – 108: 6^2 = 36, 108 = 36 + 72
  • 5 – 75: 5^2 = 25, 75 = 25 + 50

However, 3^2 = 9, and 99 is not 9 plus any multiple of 9.

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