General Studies · Number Analogy

Given below are two sets of numbers. In each set of numbers, a certain mathematical operation on the first number results in the second number. Similarly, a certain mathematical operation on the second number results in the third number and so on. Which of the options follows the same set of operations as given in the question? (NOTE: A two/three-digit number cannot be broken down into individual digits for operations. E.g. if 37 is followed by 10, the operation cannot be 3 + 7, as a two-digit number cannot be broken down into individual digits.)4 - 20 - 40 - 47 ; 6 - 30 - 60 - 67