Select the set in which the numbers are related in the same way as the numbers of the given sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into their constituent digits. E.g. 13 – Operations on 13 such as adding/subtracting/multiplying, etc., to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)

(18, 3, 9)

(36, 6, 18)

(18, 3, 9)

(36, 6, 18)

​Logic: 2nd × 6 = 1st and 2nd × 3 = 3rd

3 × 6 = 18; 3 × 3 = 9

6 × 6 = 36; 6 × 3 = 18

Let's check each options:

(a) (72, 13, 36) = 13 × 6 = 78; 13 × 3 = 39 (Not Follow)

(b) (78, 13, 39) = 13 × 6 = 78; 13 × 3 = 39 (Follow)​

(c) (72, 14, 39) = 14 × 6 = 84; 14 × 3 = 42 (Not Follow)

(d) (78, 14, 39) = 14 × 6 = 84; 14 × 3 = 42 (Not Follow)​

So, only option (b) follows the same logic.

Thus, the correct option is: (b)