In the following number-pairs, the second number is obtained by applying certain mathematical operations to the first number. 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.B. 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)
11, 110
19, 190

Correct option is A

The given number pairs:
11 → 110
19 → 190

Logic = Multiply the first number by 10 to get second term.
Step 1: Identify the Pattern
Observing the pattern:
11 × 10 = 110
19 × 10 = 190
So, the rule seems to be:
Step 2: Check the Options
A) 31 → 310
31 × 10 = 310 (Follows the pattern)
B) 22 → 440
22 × 10 = 220 (Not 440) 
C) 91 → 190
91 × 10 = 910 (Not 190) 
D) 51 → 150
51 × 10 = 510 (Not 150) 
Step 3: Select the Correct Answer
The correct set following the same pattern is:
Option A) 31, 310