Which of the following options is NOT an example of a number triad with the following properties?
1. Sum of the digits of the third number is twice the sum of the digits of the first number.
2. Sum of the digits of the second number is thrice the sum of the digits of the first number.

By Trial and Error method,

Option A

Sum of the digits of the first number = 2 + 0 + 1 = 3

Sum of the digits of the second number = 7 + 0 + 2 = 9

Sum of the digits of the third number = 3 + 0 + 3 = 6

(201, 702, 303) follows the given properties. Hence option A is incorrect.

Option B

Sum of the digits of the first number = 4 + 0 + 0 = 4

Sum of the digits of the second number = 6 + 6 + 0 = 12

Sum of the digits of the third number = 8 + 0 + 0 = 8

(400, 660, 800) follows the given properties. Hence option B is incorrect.

Option C

Sum of the digits of the first number = 2 + 0 + 0 = 2

Sum of the digits of the second number = 6 + 0 + 0 = 6

Sum of the digits of the third number = 3 + 0 + 0 = 3

Sum of the digits of the third number is not twice the sum of the digits of the first number.

Hence, the correct answer is Option C