Select the set in which the numbers are related in the same way as are the numbers of the following sets. (NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its 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)

(14, 42, 7)
(12, 34, 5)

Given:

(14, 42, 7)
(12, 34, 5)

Logic = (First number + third number) ×2 = second number
(14, 42, 7) = (14 + 7) × 2 = 21 × 2 = 42
(12, 34, 5) = (12 + 5) × 2 = 17 × 2 = 34
similarly,

From the option (a)

43, 144, 29 = (43 + 29 ) × 2 = 72 × 2 = 144

Correct answer is (a).