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Answer

Correct Option is 12

Solution:In this input-output question, only numbers are arranged in each step. Let us understand the logic behind it.
Step 1: First the sum of the first digit of the first block and first digit of the second blocks and sum of the second digit of the first blocks and second digit of the second block is taken. Now the addition of these two sums are taken. Similarly, the process continues for the next two inputs and so on.
Step 2: Now product of the first digits of every block of the previous step and then the product of the last digits of every block of the previous step are taken.
Step 3: Addition of the digits in each of the blocks.
Step 4: Now the difference between these two numbers of step III is taken formed in step 3.
 

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