Below are given two sets of numbers. In each set of numbers, a certain mathematical operation on the first number results in the second number. Similarly, certain mathematical operation on the second number results in the third number and so on. Which of the given options follows the same set of operations as in question? (NOTE – A two/three-digit number cannot be broken 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 into individual digits.)

7 - 21 - 31 - 62; 9 - 27 - 37 - 74

The correct option is 11-33-43-86.

Let us analyze the mathematical pattern and operations followed in the given sets of numbers:

Set 1: 7 - 21 - 31 - 62

1. First number to second number: $7\times 3=21$

2. Second number to third number: $21+10=31$

3. Third number to fourth number: $31\times 2=62$

Set 2: 9 - 27 - 37 - 74

1. First number to second number: $9\times 3=27$

2. Second number to third number: $27+10=37$

3. Third number to fourth number: $37\times 2=74$

Thus, the sequence of operations applied to the numbers in each set is:

1st number $\times 3$ ⇒ 2nd number $+10$ ⇒ 3rd number $\times 2$ ⇒ 4th number

Now, let us check the options to see which set follows this exact same sequence of operations:

Option 1: 11 - 33 - 43 - 86

1. $11\times 3=33$

2. $33+10=43$

3. $43\times 2=86$

This option follows the exact pattern ($\times 3$, $+10$, $\times 2$).

Therefore, the set 11-33-43-86 follows the same set of mathematical operations as given in the question.